Browser Utilities

Yasaboy Tools

PDF, audio, video, QR, Sinhala typing, and utility tools that run directly in your browser.

Local-first Selected files are processed in the browser and are not uploaded by these tools.

PDF Runs on your device

Markdown to PDF

Write Markdown with live preview, then export as PDF or Word.

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PDF Runs on your device

PDF Merge

Combine multiple PDF files in a controlled order.

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PDF Runs on your device

PDF Optimize

Rewrite a PDF to reduce structural overhead where possible.

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PDF Online required

Website to PDF

Load a public page preview and export the captured result.

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PDF Runs on your device

PDF Split

Extract a page range into a new PDF, or split each page out.

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PDF Runs on your device

Rotate PDF

Rotate all or selected pages and export a new PDF.

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PDF Runs on your device

Delete PDF Pages

Remove unwanted pages and export a clean PDF.

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PDF Runs on your device Works offline after first load No server upload

PDF Metadata Viewer

Read PDF file info, page count, title, author, and dates locally.

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PDF Runs on your device Heavy browser processing No server upload

PDF Reorder Pages

Move pages up or down and export a reordered PDF.

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PDF Runs on your device

Image to PDF

Combine JPG, PNG or WebP images into one PDF with page sizing.

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PDF Runs on your device

CSV to PDF

Parse CSV locally and export a clean, paginated PDF table.

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PDF Experimental

PDF to Images

Render PDF pages to PNG or JPEG images in your browser.

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PDF Experimental

PDF to Word (Lite)

Extract text and export a Word-compatible .doc. Text only.

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PDF Experimental

Presentation to PDF (Lite)

Build a PDF deck from Markdown slides or images.

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Image Runs on your device

Image Resize

Resize images to exact dimensions with the Canvas API.

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Image Runs on your device

Image Compress

Shrink image file size with a quality slider and live sizes.

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Image Runs on your device

Image Crop

Drag to crop with free, 1:1, 4:3 or 16:9 presets. Shows before/after size.

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Image Runs on your device

Photo Editor (Lite)

Crop, resize, rotate, flip, add text and basic adjustments in one tool.

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Image Runs on your device Permission required Works offline after first load No server upload

Camera Capture

Capture photos from your camera and download them locally.

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Image Runs on your device Permission required Experimental Works offline after first load No server upload

Document Scanner Lite

Capture or upload a document photo, crop, adjust, and export PNG/JPEG/PDF.

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Image Runs on your device Works offline after first load No server upload

Screenshot Annotator

Upload or paste a screenshot and annotate with arrows, shapes, text, and blur.

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Utility Runs on your device Permission required No server upload Experimental

QR Scanner

Decode QR codes from camera, screen capture + crop, or image upload. Local jsQR.

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Screen Runs on your device Works offline after first load No server upload

Whiteboard Lite

Quick board for teaching and diagrams with pen, shapes, text, autosave, and export.

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Image Runs on your device

Photo Merge

Stack or place photos side by side into one image.

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Image Runs on your device

Photo Collage

Arrange photos on a grid with gaps and borders.

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Image Runs on your device

Add Text to Image

Overlay captions with font, size, color and position.

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Image Runs on your device

Image Watermark

Add a text or logo watermark with opacity and position.

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Audio & Video Works offline after first load

Video to Audio

Extract WAV audio from video files directly in your browser.

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Utility Runs on your device

QR Code Generator

Create styled QR codes with Sinhala, Unicode, colours, logos and PNG/SVG downloads.

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Sinhala & Language Works offline after first load

Singlish to Sinhala Typing

Type Sinhala using English letters and copy clean Sinhala Unicode instantly.

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Audio & Video Online required

Direct Video Downloader

Download videos from direct public MP4, WebM, MOV or OGG file links.

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Audio & Video Runs on your device

Sound Recorder

Record from your microphone with pause/resume. Stays on your device.

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Audio & Video Experimental

Audio Trim (Lite)

Cut audio to start/end points, preview selection, export WAV locally.

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Audio & Video Runs on your device

Audio Converter (Lite)

Convert audio to WAV or compressed WebM/Opus in your browser.

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Audio & Video Runs on your device

Video Metadata Viewer

See duration, dimensions, type and size of a media file.

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Audio & Video Experimental

Video Compress (Lite)

Downscale and re-encode short videos to WebM. Real-time, heavy.

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Audio & Video Experimental Heavy browser processing

Video Trim (Lite)

Select start/end, preview clip, export trimmed WebM when supported.

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Audio & Video Experimental Heavy browser processing

Video Crop (Lite)

Select a crop region on video and export cropped WebM. Experimental.

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Developer & Text Runs on your device

Word Counter

Live word, character, sentence and reading-time stats for any text.

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Developer & Text Runs on your device

JSON Formatter

Beautify, validate and minify JSON with clear error messages.

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Developer & Text Runs on your device

Base64 Tools

Encode and decode Base64 text, and turn files into data URLs.

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Developer & Text Runs on your device Works offline after first load No server upload

URL Encoder / Decoder

Encode or decode URI components and parse query parameters.

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Developer & Text Runs on your device Works offline after first load No server upload

UUID Generator

Generate UUID v4 values with secure browser randomness.

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Developer & Text Runs on your device Works offline after first load No server upload

JWT Decoder Local

Decode JWT header and payload locally. No signature verification.

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Developer & Text Runs on your device Works offline after first load No server upload

Regex Tester

Test regex patterns, flags, matches, and replacement preview.

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Developer & Text Runs on your device Works offline after first load No server upload

Text Diff Tool

Line-by-line diff between two texts with copy/download.

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Developer & Text Runs on your device Works offline after first load No server upload

Code Formatter Lite

Lite JSON/HTML/CSS/JS format and minify — not full Prettier.

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Developer & Text Runs on your device Works offline after first load No server upload

Markdown Previewer

Type markdown and see a live preview using a built-in parser — no CDN libraries.

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Developer & Text Runs on your device Works offline after first load No server upload

Prompt Optimizer

Turn vague prompts into structured templates for coding, agents, email, research, and more — 100% local.

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AI / Productivity Runs on your device Works offline after first load No server upload

AI Prompt Studio

Optimize and generate prompts for coding, image generation, design, research, writing, and AI agents.

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Developer & Text Runs on your device Works offline after first load No server upload

CSV to JSON Converter

Paste CSV and get JSON arrays or objects — parsed entirely in your browser.

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Developer & Text Runs on your device Works offline after first load No server upload

JSON to CSV Converter

Turn a JSON array into CSV with optional nested-key flattening.

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Developer & Text Runs on your device Works offline after first load No server upload

SQL Formatter Lite

Uppercase keywords and add simple line breaks for SELECT queries locally.

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Developer & Text Runs on your device Works offline after first load No server upload

HTML Preview Sandbox

Render HTML snippets in an isolated iframe — scripts are blocked by default.

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Developer & Text Runs on your device Works offline after first load No server upload

CSS Gradient Generator

Design linear or radial gradients and copy the CSS background rule.

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Developer & Text Runs on your device Works offline after first load No server upload

Color Palette Generator

Build harmonious palettes from one base color or randomize locally.

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Developer & Text Runs on your device Works offline after first load No server upload

Cron Helper

Understand standard 5-field cron expressions and preview next run times in your timezone.

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File & Utility Runs on your device Works offline after first load No server upload

File Viewer Hub

Preview local files and jump to the right Yasaboy tool.

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File & Utility Runs on your device Works offline after first load No server upload Heavy browser processing

ZIP Lite

Create and extract ZIP archives locally. No upload, no server.

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System Runs on your device Works offline after first load No server upload

Local Data Manager

View and clear Yasaboy-owned localStorage and IndexedDB on this device.

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System Runs on your device No server upload Browser support varies

System Share Tool

Share text, URLs, or files via the system share sheet with copy/download fallbacks.

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System Runs on your device Works offline after first load

Privacy & Local-first Center

What runs locally, permissions, storage, and how to clear site data.

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Security Runs on your device Works offline after first load No server upload

Hash Generator

SHA-1/256/384/512 hashes for text or files using Web Crypto.

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Security Runs on your device Heavy browser processing No server upload

Checksum Tool

Compute a file checksum and compare with an expected value.

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Security Runs on your device Works offline after first load No server upload

Password Generator

Strong random passwords with crypto.getRandomValues.

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Security Runs on your device No server upload

Password Strength Checker Lite

Local-only password estimate with practical suggestions.

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Security Runs on your device Works offline after first load No server upload

Password Hash Tool

Educational SHA and PBKDF2 demo — not for production storage.

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Utility Runs on your device

Color Converter

Convert between HEX, RGB and HSL with a live preview.

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Utility Runs on your device

Timestamp Converter

Convert Unix timestamps to readable dates and back.

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Utility Runs on your device

Unit Converter Lite

Convert length, weight, temperature, data, time and speed units.

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Utility Runs on your device

Smart Calculator

Arithmetic, percentages, unit conversion, age and date difference.

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Calculator Runs on your device Works offline after first load No server upload

BMI Calculator

Compute BMI from weight and height with metric or imperial units and category.

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Calculator Runs on your device Works offline after first load No server upload

Loan EMI Calculator

Estimate monthly EMI, total payment, interest, and a sample amortization schedule.

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Calculator Runs on your device Works offline after first load No server upload

Date Difference Calculator

Measure the span between two calendar dates in years, months, days, and totals.

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Calculator Runs on your device Works offline after first load No server upload

Random Picker

Enter choices and pick one winner or several unique picks with local randomness.

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Calculator Runs on your device Works offline after first load No server upload

Percentage Calculator

What is X% of Y, what percent is X of Y, increase, decrease, and percent change.

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Calculator Runs on your device Works offline after first load No server upload

Currency Format Helper

Format amounts with currency codes, locales, and decimal rules — display only.

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Calculator Runs on your device Works offline after first load No server upload

Time Zone Meeting Helper

See one meeting time across fixed UTC offsets — no geolocation API.

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Calculator Runs on your device Works offline after first load No server upload

Unit Price Calculator

Compare up to three products by price per kg, litre, or piece.

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Study Runs on your device Works offline after first load No server upload

Pomodoro Timer

Focus and break cycles with optional beep and local autosave.

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Study Runs on your device Works offline after first load No server upload

Flashcards Lite

Build a local deck, flip cards in study mode, shuffle, and export JSON.

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Study Runs on your device Works offline after first load No server upload

Study Planner

Plan study tasks by day of the week with local autosave.

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Study Runs on your device Works offline after first load No server upload

Assignment Tracker

Track assignments with due dates, priority, status, and CSV export.

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Study Runs on your device Works offline after first load No server upload

GPA Calculator

Compute semester and cumulative GPA on a 4.0 letter scale.

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Study Runs on your device Works offline after first load No server upload

Citation Generator Lite

Generate simplified APA-style citations for books, journals, and websites.

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Study Runs on your device Works offline after first load No server upload

Cornell Notes Maker

Cues, notes, and summary columns with local PDF and TXT export.

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Study Runs on your device Works offline after first load No server upload

Exam Countdown

Track days and time left until your exams with local autosave.

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Office Runs on your device Works offline after first load No server upload

Resume Builder Lite

Fill resume sections with local autosave, PDF export, and copy text.

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Office Runs on your device Works offline after first load No server upload

Cover Letter Builder

Write a cover letter from template fields; copy or download TXT.

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Office Runs on your device Works offline after first load No server upload

Invoice Generator

Create invoices with line items, tax, discount, and PDF export.

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Office Runs on your device Works offline after first load No server upload

Expense Tracker Lite

Log income and expenses by category with summary and CSV/JSON export.

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Office Runs on your device Works offline after first load No server upload

Kanban Board

Organize tasks in Todo, Doing, and Done columns with drag-and-drop.

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Office Runs on your device Works offline after first load No server upload

Habit Tracker

Track daily habits, streaks, and JSON import/export locally.

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Office Runs on your device Works offline after first load No server upload

Meeting Notes Maker

Capture agenda, attendees, notes, and actions with TXT/PDF export.

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Office Runs on your device Works offline after first load No server upload

Application Writer Lite

Draft a formal application letter with review warning; copy or download.

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Creator / Social Runs on your device Works offline after first load No server upload

Status Size Maker

Design status images at common social sizes with background and text; export PNG or JPEG.

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Creator / Social Runs on your device Works offline after first load No server upload

WhatsApp Status Creator

Design vertical 9:16 status images with text overlays and colorful backgrounds.

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Creator / Social Runs on your device Works offline after first load No server upload

Story Cover Maker

Design reel or story covers with title, subtitle, and gradient backgrounds at 9:16 or 1:1.

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Creator / Social Runs on your device Works offline after first load No server upload

Thumbnail Maker Lite

Upload a background image and add a bold title with shadow on a 1280×720 canvas.

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Creator / Social Runs on your device Experimental No server upload

Video Status Cutter Lite

Trim a local video to status length, preview the clip, and export WebM when supported.

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Creator / Social Runs on your device Works offline after first load No server upload

Caption Card Creator

Create caption image cards for social posts with styled backgrounds and local PNG export.

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Creator / Social Runs on your device Works offline after first load No server upload

Quote Image Creator

Design quote images with text, author line, and background for social sharing.

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Creator / Social Runs on your device Works offline after first load No server upload

Social Post Size Converter

Upload an image and convert it to a target social size using cover, contain, or stretch.

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Download Online required

Universal Link Downloader

Download direct file links, or copy curl/wget commands. No bypassing.

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Download Online required

curl Tester (Lite)

Probe a URL and generate curl/wget commands. CORS rules apply.

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Developer & Server Runs on your device Works offline after first load No server upload Guide / command builder

Remote Server Toolkit

Build SSH/SCP/log commands, save server profiles, paste terminal logs, and visualize file trees. No real SSH connection.

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Download Runs on your device Experimental Same network recommended No server upload

Nearby File Share Lite

Send files between phone and laptop using browser peer-to-peer pairing.

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System Online required

Network Speed (Lite)

Check connection status and a light latency estimate.

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System Guide only

Windows Speed Guide

Safe cleanup steps and copyable commands for a faster PC.

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Screen Runs on your device

Screen Recorder

Record a tab, window or full screen with optional mic. Stays local.

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Screen Guide only

Android Screen Guide

Mirror and control Android on Windows with scrcpy and ADB.

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Mini Office Runs on your device Works offline after first load Experimental No server upload

Sheet Lite

Lightweight spreadsheet: CSV/XLSX import, cell editing, formulas, local drafts.

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Mini Office Runs on your device Works offline after first load Experimental No server upload

Docs Lite

Lightweight document editor: rich text, TXT/HTML/DOCX import, local drafts.

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Mini Office Experimental Runs on your device Works offline after first load No server upload

Presentation Lite

Create simple slides in your browser and export them locally.

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Essential Apps Runs on your device Works offline after first load No server upload

Paint Lite

Simple drawing board with brush, shapes, undo, import and PNG/JPEG export.

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Essential Apps Runs on your device Works offline after first load No server upload

Notepad Lite

Plain-text notepad with autosave, find/replace, and TXT/MD download.

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Essential Apps Runs on your device Works offline after first load No server upload

Sticky Notes

Local sticky notes with colors, search, and JSON backup export.

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Essential Apps Runs on your device Works offline after first load No server upload

Signature Pad

Draw a signature and export a transparent PNG locally.

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Essential Apps Runs on your device Works offline after first load No server upload

Text Cleaner

Clean pasted text: spaces, empty lines, case, duplicates, and line numbers.

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Utility Runs on your device

Barcode Generator

Generate CODE128, EAN, UPC and more, then download PNG or SVG.

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