All Free Online Tools

122 tools that process in your browser. Free, private, no signup.

PDF Tools

11 tools

Merge PDF

Combine multiple PDF files into one document — entirely in your browser, no uploads.

Compress PDF

Reduce PDF file size without losing quality, right in your browser.

PDF to Word

Convert PDF documents to editable Word files directly in your browser.

Word to PDF

Convert Word documents to PDF format instantly in your browser.

Split PDF

Extract pages or split a PDF into multiple files — all in your browser.

PDF to JPG

Convert PDF pages to JPG images entirely in your browser — no uploads.

PDF to PNG

Convert PDF pages to PNG images entirely in your browser — no uploads.

Rotate PDF

Rotate PDF pages 90°, 180°, or 270° — all processing in your browser.

JPG to PDF

Convert JPG images to PDF documents — combine multiple images into one PDF in your browser.

Edit PDF

Edit PDF documents online — add text, annotations, highlights, and drawings in your browser.

CSV to PDF

Convert CSV and Excel spreadsheets to formatted PDF tables — right in your browser.

Image Tools

27 tools

Compress Image

Reduce image file size while preserving quality — no uploads, browser only.

Resize Image

Resize images to any dimension quickly in your browser. No server needed.

PNG to JPG

Convert PNG images to JPG format in your browser with no file uploads.

JPG to PNG

Convert JPG images to PNG format instantly in your browser.

WebP to PNG

Convert WebP images to PNG format right in your browser with no uploads.

WebP to JPG

Convert WebP images to JPG format locally in your browser.

SVG to PNG

Convert SVG vector images to PNG format in your browser with no uploads.

JPG to WebP

Convert JPG images to WebP format for smaller file sizes — all in your browser.

PNG to WebP

Convert PNG images to WebP format for smaller file sizes — all in your browser.

BMP to JPG

Convert BMP images to JPG format in your browser with no file uploads.

TIFF to JPG

Convert TIFF images to JPG format in your browser with no uploads needed.

GIF to PNG

Convert GIF images to PNG format in your browser — extracts the first frame.

ICO to PNG

Convert ICO icon files to PNG format in your browser with no uploads.

AI Background Remover

Remove image backgrounds instantly with AI — entirely in your browser, no uploads.

AI Image Upscaler

Upscale and enhance image resolution with AI — 2x and 4x enlargement in your browser.

AI Image to Text (OCR)

Extract text from images and scanned documents using AI OCR — runs locally in your browser.

AI Photo Enhancer

Enhance photo quality with AI — sharpen, denoise, and improve clarity in your browser.

AI Object Remover

Remove unwanted objects from photos with AI inpainting — entirely in your browser.

AI Photo Colorizer

Colorize black and white photos with AI — bring old photos to life in your browser.

AI Photo Restoration

Restore old and damaged photos with AI — fix scratches, enhance faces, and improve clarity.

HEIC to JPG

Convert iPhone HEIC photos to JPG format instantly — right in your browser, no uploads.

Crop Image

Crop images to any size or aspect ratio — entirely in your browser, no uploads needed.

Add Watermark

Add text or image watermarks to your photos — entirely in your browser, no uploads.

AVIF to PNG

Convert AVIF images to PNG format instantly in your browser. No uploads, no quality loss.

AVIF to JPG

Convert AVIF images to JPG format instantly in your browser. No uploads, universal compatibility.

HEIC to PNG

Convert iPhone HEIC photos to lossless PNG format — right in your browser, no uploads.

TIFF to PNG

Convert TIFF images to PNG format in your browser — lossless quality, no uploads.

Converters

7 tools

MP4 to MP3

Extract audio from video files and save as MP3, entirely in your browser.

Video to GIF

Convert short video clips to animated GIFs in your browser with no uploads.

WebM to MP4

Convert WebM videos to universally compatible MP4 format in your browser.

FLAC to MP3

Convert lossless FLAC audio to MP3 for universal playback, entirely in your browser.

MKV to MP4

Convert MKV (Matroska) video files to MP4 format directly in your browser.

GIF to MP4

Convert animated GIFs to MP4 video for smaller file sizes and better quality.

OGG to MP3

Convert OGG Vorbis audio files to MP3 format in your browser.

Calculators

10 tools

Mortgage Calculator

Calculate monthly mortgage payments, total interest, and amortization schedules.

Compound Interest Calculator

Calculate how investments grow over time with compound interest.

Loan Calculator

Calculate monthly loan payments and total repayment amounts.

Salary Calculator

Calculate take-home pay, hourly rates, and annual salary breakdowns.

Retirement Calculator

Estimate your retirement savings and when you can retire comfortably.

BMI Calculator

Calculate your Body Mass Index instantly with metric or imperial units.

Calorie Calculator

Estimate daily calorie needs based on your age, weight, height, and activity level.

TDEE Calculator

Calculate your Total Daily Energy Expenditure to plan your nutrition goals.

Percentage Calculator

Calculate percentages, percentage changes, and percentage of totals.

Age Calculator

Calculate exact age in years, months, and days from a date of birth.

Developer Tools

18 tools

JSON Formatter

Format, validate, and minify JSON data in your browser. Supports syntax highlighting.

Base64 Encode / Decode

Encode or decode Base64 strings directly in your browser.

URL Encode / Decode

Encode or decode URL strings and query parameters in your browser.

Regex Tester

Test and debug regular expressions with real-time match highlighting.

Hash Generator

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from any text — entirely in your browser.

JWT Decoder

Decode and inspect JSON Web Tokens — header, payload, and signature — in your browser.

Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa — all in your browser.

Diff Checker

Compare two blocks of text and see the differences highlighted side by side.

CSS Minifier

Minify CSS code by removing whitespace, comments, and redundant syntax — all in your browser.

JavaScript Minifier

Minify JavaScript code by removing whitespace, comments, and shortening syntax.

SQL Formatter

Format and beautify SQL queries with proper indentation and keyword capitalization.

HTML Beautifier

Format and beautify HTML code with proper indentation — all in your browser.

XML Formatter

Format, beautify, and validate XML documents with proper indentation in your browser.

YAML Validator

Validate and format YAML syntax with clear error messages — all in your browser.

Color Picker

Pick colors and convert between HEX, RGB, HSL, and HSB formats instantly.

CSS Gradient Generator

Create beautiful CSS gradients with a visual editor and copy the code instantly.

Markdown Editor

Write Markdown with a live preview side by side — all in your browser.

Cron Expression Generator

Build and decode cron expressions with a visual editor and human-readable descriptions.

Text Tools

5 tools

Word Counter

Count words, sentences, paragraphs, and reading time in any text.

Character Counter

Count characters, words, and lines — with and without spaces.

Text Case Converter

Convert text between UPPERCASE, lowercase, Title Case, camelCase, and more.

Find and Replace

Find and replace text with support for regular expressions — all in your browser.

Remove Line Breaks

Remove or replace line breaks, extra spaces, and blank lines from text instantly.

Generators

4 tools

QR Code Generator

Generate QR codes for URLs, text, email, and more — entirely in your browser.

UUID Generator

Generate random UUIDs (v4) and other UUID versions instantly in your browser.

Password Generator

Generate strong, random passwords with customizable length and character sets.

Lorem Ipsum Generator

Generate placeholder lorem ipsum text in paragraphs, sentences, or words.

Data Tools

9 tools

JSON to CSV

Convert JSON to CSV online free. Paste or upload JSON arrays and download CSV files instantly.

CSV to JSON

Convert CSV data to JSON arrays instantly in your browser.

XML to JSON

Convert XML documents to JSON format in your browser — no server needed.

JSON to XML

Convert JSON data to XML format instantly in your browser.

YAML to JSON

Convert YAML to JSON format instantly in your browser.

Markdown to HTML

Convert Markdown text to HTML code instantly in your browser.

HTML to Markdown

Convert HTML code to Markdown format instantly in your browser.

CSV to Excel

Convert CSV files to Excel (.xlsx) spreadsheets instantly in your browser.

Markdown to PDF

Convert Markdown files to beautifully formatted PDF documents in your browser.

Video Tools

12 features

Video Editor

Full browser-based editor — trim, merge, add text & music, filters, and more

TrimMergeTextMusicCompressCropSpeedFiltersResizeRotate

Crypto Tools

10 tools

Crypto Unit Converter

Convert between Satoshi, Bitcoin, Gwei, Wei, and ETH units instantly in your browser.

Crypto Profit Calculator

Calculate crypto profit, loss, ROI, and net returns after trading fees.

Crypto DCA Calculator

Simulate dollar-cost averaging any cryptocurrency with real historical prices.

Impermanent Loss Calculator

Calculate impermanent loss for any DeFi liquidity pool. Compare HODL vs LP returns.

Crypto Liquidation Calculator

Calculate your liquidation price for leveraged crypto positions on Binance, Bybit, and OKX.

Crypto Position Size Calculator

Calculate the right position size based on your account balance, risk tolerance, and stop loss.

Crypto Market Cap Calculator

Calculate market cap, fully diluted valuation, and compare "what if" scenarios between coins.

APR to APY Calculator

Convert between APR and APY with different compounding frequencies. See real earnings on $1,000.

Crypto Address Validator

Validate any crypto wallet address. Auto-detects Bitcoin, Ethereum, Solana, and more.

Crypto QR Code Generator

Generate payment QR codes for Bitcoin, Ethereum, Solana, and more with BIP21/EIP-681 URIs.

Audio Tools

9 tools

Audio Trimmer

Trim and cut MP3, WAV, and other audio files — entirely in your browser, no uploads.

Voice Recorder

Record audio from your microphone — instantly in your browser with no software to install.

Audio Converter

Convert between MP3, WAV, OGG, FLAC, AAC, and more — right in your browser.

Audio Compressor

Compress audio files to reduce size while preserving quality — in your browser.

MP3 Joiner

Merge multiple audio files into one — combine MP3s and other formats in your browser.

Audio Speed Changer

Speed up or slow down audio playback — change tempo without affecting pitch in your browser.

Text to Speech

Convert text to natural-sounding speech — uses your browser's built-in voices, no uploads.

AI Audio Transcription

Transcribe audio and speech to text with AI — runs entirely in your browser, no uploads.

AI Noise Removal

Remove background noise from audio with AI — clean up recordings in your browser.

About brevtool's Free Online Tools

brevtool is a collection of 122+ free online tools that process everything directly in your browser. Unlike traditional online tools that upload your files to remote servers, brevtool uses WebAssembly and modern browser APIs to handle PDF manipulation, image conversion, video editing, data transformation, and more — all without transmitting a single byte of your data.

Browse tools by category: PDF Tools, Image Tools, Converters, Calculators, Developer Tools, Text Tools, Generators, Data Tools, Video Tools, Crypto Tools, Audio Tools.