All tools
ToolSink is a free directory of 94 browser-based utilities across 11 categories — PDF editing, image conversion, text cleanup, developer formatters, finance and health calculators, student helpers, social media creators and everyday utilities.
Most tools process your files and text locally in the browser, so sensitive documents never need to leave your device. No account is required and downloads are not watermarked. Each listed tool includes an original guide written for that utility — not a copied template from another site.
Prefer a walkthrough first? Visit the ToolSink blog or read how we write guides on the editorial standards page.
PDF Tools
Merge, split, compress and edit PDF files effortlessly.
Merge PDF
Combine multiple PDFs into one.
Split PDF
Split PDF into multiple files.
Compress PDF
Reduce PDF file size.
Rotate PDF
Rotate all or selected pages by 90/180/270°.
Image to PDF
Convert JPG or PNG images into a single PDF.
PDF Studio
All-in-one PDF editor: merge, split, rotate, remove pages, reorder and watermark — 100% in your browser.
PDF Visual Editor
Visually add text, fill forms, whiteout, and annotate PDFs in browser.
Text & Image to PDF
Create a PDF from scratch by combining a title, text, and an image.
HTML to PDF
Convert raw HTML code or an HTML file into a perfectly formatted PDF document.
PDF Password Remover
Unlock a password-protected PDF and download an unrestricted copy.
Add Watermark to PDF
Stamp text watermarks across every page of a PDF.
Add Images to PDF
Insert photos or scans into an existing PDF as new pages.
Remove PDF Pages
Delete unwanted pages from a PDF and download a slimmer file.
PDF to Word
Convert PDF text into an editable .docx Word document.
Word to PDF
Convert .docx Word files into a shareable PDF document.
Image Tools
Convert, compress and resize images without quality loss.
JPG to PNG
Convert JPG images to PNG.
PNG to JPG
Convert PNG images to JPG.
SVG to PNG
Convert SVG vectors to PNG format.
Image Compressor
Reduce image size without losing quality.
Image Resizer
Resize images to any dimension.
Image Background Remover
Remove image background 100% free in your browser.
OG Image Generator
Design free Open Graph 1200x630 social media sharing images for your website.
Image Studio
All-in-one image editor: compress, resize, convert, rotate, crop, palette, Base64 and OCR — 100% in your browser.
Image to Base64
Convert any image into a Base64 data URI you can paste into code.
Image Color Extractor
Pull the dominant colours from any image as a ready-to-use palette.
Image to Text (OCR)
Upload an image and extract all text in English or Hindi — 100% in your browser.
Meme Generator
Create custom memes with text, templates, and funny emojis.
Sticker Editor
Turn photos into funny stickers with custom outlines, shapes, and accessories.
Comic Speech Bubble Generator
Add speech, thought, whisper, and scream bubbles to your pictures.
Watermark Image
Add text or logo watermarks to images in your browser.
Favicon Generator
Generate multi-size favicon PNGs and a downloadable ZIP pack.
EXIF Viewer
Inspect photo EXIF metadata and download a clean image with metadata stripped.
Text Tools
Count, transform and compare text instantly.
Word Counter
Count words, sentences and paragraphs instantly.
Character Counter
Character and byte counter with limits.
Case Converter
UPPER, lower, Title & Sentence case.
Text Compare
Compare two texts side by side.
Remove Duplicate Lines
Delete repeated lines with case/whitespace options.
Remove Extra Spaces
Collapse repeated spaces, tabs and blank lines in one click.
Alphabetical Sorter
Sort a list of lines A→Z or Z→A with case and length options.
Developer Tools
JSON, Base64, UUID and other utilities for developers.
JSON Formatter
Format, validate and minify JSON.
Base64 Encode/Decode
Encode & decode Base64 strings.
UUID Generator
Generate v4 UUIDs.
Regex Tester
Test regular expressions with live match highlighting and groups.
SQL Formatter
Format SQL queries into readable multi-line syntax.
SQL Query Generator
Transform raw multi-line data into clean SQL INSERT or UPDATE statements.
HTML Formatter
Indent and prettify HTML, XML and JSX markup.
API Response Formatter
Paste any API response — auto-detects JSON/XML and prettifies it.
JSON to C# Class Generator
Turn a JSON payload into strongly-typed C# model classes.
JWT Decoder
Decode and inspect JSON Web Tokens securely without sending them to a server.
Timestamp Converter
Convert Unix epoch timestamps to human-readable dates and vice-versa.
Data Format Converter
Instantly convert between JSON, CSV, and Excel formats securely in your browser.
Free API Tester Online (Postman Alternative)
Test REST APIs online with our free API testing tool. Bypass CORS and inspect JSON responses instantly in this fast Postman alternative.
XML Formatter
Pretty-print, validate and minify XML documents in your browser.
URL Encoder / Decoder
Encode and decode URLs with full component and query-string support.
SVG Viewer & Converter
Paste raw SVG code to preview the image instantly, and download it as an SVG or PNG file.
Markdown Converter
Write Markdown with live preview, then copy HTML or download as HTML/PDF.
File Hash Checker
Compute MD5, SHA-256 and SHA-512 hashes of any file entirely in your browser.
Finance Calculators
EMI, SIP, GST and other finance calculators.
EMI Calculator
Calculate monthly loan EMI.
SIP Calculator
Systematic Investment Plan calculator.
GST Calculator
Compute GST inclusive / exclusive prices.
Currency Converter
Convert currencies with live exchange rates.
Standard Calculator
A fast, free, and easy-to-use online basic calculator.
Percentage Calculator
Work out percentages, increases, decreases and what-of-what in one place.
Discount Calculator
Calculate sale price, savings and final total for any discount.
Income Tax Calculator
Estimate India income tax for FY 2025-26 under New and Old regimes.
FD Calculator
Calculate fixed deposit maturity with compound interest.
Health Calculators
BMI and health-related calculators for daily use.
BMI Calculator
Body Mass Index calculator.
BMR Calculator
Estimate your Basal Metabolic Rate — calories burned at rest.
Calorie Calculator
Find your daily calorie needs (TDEE) for loss, maintenance or gain.
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy method.
Ideal Weight Calculator
Find your ideal healthy weight range using medical formulas.
Student Tools
Handy calculators and helpers for students.
Kids Math Trainer
Interactive math practice for kids with visual objects, timers, and fun rewards.
Kids Learning Studio
LKG–Class 1 brain games: opposites, memory, patterns, rhymes, counting, odd one out & more — with speak-on-tap.
GPA Calculator
Compute semester or cumulative GPA from grades & credits (4.0 / 4.5 scale).
Pomodoro Timer
Classic 25/5-min study cycles with long-breaks and cycle counter.
Unit Converter
Convert length, mass, temperature, volume, speed, area, time and data units.
Social Media
Bios, captions, hashtags, WhatsApp message formatting and a visual post designer for Instagram, LinkedIn and WhatsApp.
Bio Generator
Generate short bios for Instagram, X, LinkedIn and TikTok from a topic and tone.
Hashtag Generator
Get ranked hashtag sets by topic, grouped by reach for posts and Reels.
Caption Generator
Draft captions in funny, bold, professional and other voices you can paste anywhere.
WhatsApp Message Generator
Format WhatsApp text with bold, stickers, green ticks, red errors and emoji styling.
Social Media Post Designer
Design Instagram, LinkedIn and WhatsApp posts from templates and export as PNG.
Utility
QR & barcodes, passwords, speech tools, invoice & resume builders, colour picker and everyday calculators.
QR Code Generator
Create a QR code from any URL or text and download it as an image.
Password Generator
Generate strong random passwords with length and symbol options.
Age Calculator
Calculate exact age from a birth date in years, months, days, hours and minutes.
Barcode Generator
Generate CODE128, EAN, UPC and other 1D barcodes and save as SVG or PNG.
Color Picker
Pick or sample colours and convert between HEX, RGB and HSL values.
Fraction Calculator
Add, subtract, multiply and divide fractions with automatic simplification.
Average Calculator
Find mean, median, mode and range from a list of numbers.
Text to Speech
Read any text aloud using built-in browser voices — no upload needed.
Speech to Text
Dictate with your mic and get live transcription in the browser.
Invoice Generator
Build invoices with line items, tax and totals, then download a PDF.
Resume Builder
Fill in your CV, pick from six templates, preview live and download PDF.
Video Tools
Trim, compress and convert videos locally.
Audio Tools
Trim, edit and convert audio files locally.