Yasaboy Tools

PDF Runs on your device

Markdown to PDF

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

Open tool PDF Runs on your device

PDF Merge

Combine multiple PDF files in a controlled order.

Open tool PDF Runs on your device

PDF Optimize

Rewrite a PDF to reduce structural overhead where possible.

Open tool PDF Online required

Website to PDF

Load a public page preview and export the captured result.

Open tool PDF Runs on your device

PDF Split

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

Open tool PDF Runs on your device

Rotate PDF

Rotate all or selected pages and export a new PDF.

Open tool PDF Runs on your device

Delete PDF Pages

Remove unwanted pages and export a clean PDF.

Open tool 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.

Open tool PDF Runs on your device Heavy browser processing No server upload

PDF Reorder Pages

Move pages up or down and export a reordered PDF.

Open tool PDF Runs on your device

Image to PDF

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

Open tool PDF Runs on your device

CSV to PDF

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

Open tool PDF Experimental

PDF to Images

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

Open tool PDF Experimental

PDF to Word (Lite)

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

Open tool PDF Experimental

Presentation to PDF (Lite)

Build a PDF deck from Markdown slides or images.

Open tool Image Runs on your device

Image Resize

Resize images to exact dimensions with the Canvas API.

Open tool Image Runs on your device

Image Compress

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

Open tool Image Runs on your device

Image Crop

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

Open tool Image Runs on your device

Photo Editor (Lite)

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

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool Image Runs on your device

Photo Merge

Stack or place photos side by side into one image.

Open tool Image Runs on your device

Photo Collage

Arrange photos on a grid with gaps and borders.

Open tool Image Runs on your device

Add Text to Image

Overlay captions with font, size, color and position.

Open tool Image Runs on your device

Image Watermark

Add a text or logo watermark with opacity and position.

Open tool Audio & Video Works offline after first load

Video to Audio

Extract WAV audio from video files directly in your browser.

Open tool Utility Runs on your device

QR Code Generator

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

Open tool Sinhala & Language Works offline after first load

Singlish to Sinhala Typing

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

Open tool Audio & Video Online required

Direct Video Downloader

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

Open tool Audio & Video Runs on your device

Sound Recorder

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

Open tool Audio & Video Experimental

Audio Trim (Lite)

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

Open tool Audio & Video Runs on your device

Audio Converter (Lite)

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

Open tool Audio & Video Runs on your device

Video Metadata Viewer

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

Open tool Audio & Video Experimental

Video Compress (Lite)

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

Open tool Audio & Video Experimental Heavy browser processing

Video Trim (Lite)

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

Open tool Audio & Video Experimental Heavy browser processing

Video Crop (Lite)

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

Open tool Developer & Text Runs on your device

Word Counter

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

Open tool Developer & Text Runs on your device

JSON Formatter

Beautify, validate and minify JSON with clear error messages.

Open tool Developer & Text Runs on your device

Base64 Tools

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

Open tool 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.

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

UUID Generator

Generate UUID v4 values with secure browser randomness.

Open tool 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.

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

Regex Tester

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

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open page 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.

Open tool Security Runs on your device Heavy browser processing No server upload

Checksum Tool

Compute a file checksum and compare with an expected value.

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

Password Generator

Strong random passwords with crypto.getRandomValues.

Open tool Security Runs on your device No server upload

Password Strength Checker Lite

Local-only password estimate with practical suggestions.

Open tool 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.

Open tool Utility Runs on your device

Color Converter

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

Open tool Utility Runs on your device

Timestamp Converter

Convert Unix timestamps to readable dates and back.

Open tool Utility Runs on your device

Unit Converter Lite

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

Open tool Utility Runs on your device

Smart Calculator

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

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

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

Habit Tracker

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

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool Download Online required

Universal Link Downloader

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

Open tool Download Online required

curl Tester (Lite)

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

Open tool 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.

Open tool 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.

Open tool System Online required

Network Speed (Lite)

Check connection status and a light latency estimate.

Open tool System Guide only

Windows Speed Guide

Safe cleanup steps and copyable commands for a faster PC.

Open tool Screen Runs on your device

Screen Recorder

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

Open tool Screen Guide only

Android Screen Guide

Mirror and control Android on Windows with scrcpy and ADB.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool 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.

Open tool Utility Runs on your device

Barcode Generator

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

Open tool