All 162 Free Browser Tools

Every tool on Brevio runs in your browser. No upload, no account, no server.

PDF Tools

  • Merge PDFsCombine multiple PDF files in your browser. Free, instant, private.
  • Extract PDF PagesExtract a range of pages from a PDF in your browser. Free, instant, private.
  • Rotate PDFRotate all pages in a PDF 90°, 180°, or 270°. Runs entirely in your browser.
  • Add Page Numbers to PDFAdd page numbers to every page of a PDF in your browser. Choose position. Free, private, no upload.
  • Watermark PDFAdd a diagonal text watermark to every page of a PDF in your browser. Free, private, no upload.
  • Sign PDFDraw a signature and place it on a PDF page in your browser. No upload, no account — your document stays private.
  • Organize PDF PagesReorder, rotate, and delete PDF pages visually in your browser. No upload, no account — your file stays private.
  • Password Protect PDFAdd a password to a PDF in your browser using AES encryption. No upload, no account — your file stays private.
  • Unlock PDFRemove a known password from a PDF in your browser. No upload, no account — your file stays private.
  • Compress PDFReduce PDF overhead in your browser. Works best on PDFs with uncompressed metadata.
  • PDF to JPGConvert each page of a PDF to a JPG image, right in your browser. Files never leave your device.
  • Invoice GeneratorCreate professional PDF invoices in your browser. Add line items, tax, and notes — download instantly, nothing stored.
  • PDF to TextExtract text from any PDF directly in your browser. No upload to any server — your document never leaves your device. Supports multi-page PDFs and downloads as .txt.
  • Word to PDFConvert text to a PDF document in your browser. Choose page size, font size, and margins. Free, no upload.
  • PDF to Word / TextExtract text from a PDF in your browser using PDF.js. No upload required. Download as .txt or copy.

Image Tools

  • HEIC to JPGConvert iPhone HEIC photos to JPG in your browser. No upload, no account — your photos stay private.
  • Image to PDFCombine JPEG, PNG, or WebP images into a PDF. Each image becomes one page. Free, private.
  • Compress ImageReduce image file size in your browser. JPEG, PNG, and WebP. Free, private.
  • Image ConverterConvert images between JPG, PNG, and WebP formats. Free, private, runs in your browser.
  • Resize ImageResize images to any width in your browser. Aspect ratio preserved. Free, private.
  • SVG to PNG ConverterConvert SVG files to PNG in your browser. No upload, no server — instant and private.
  • EXIF RemoverStrip EXIF metadata from JPEG images in your browser. Remove GPS, camera, and date data before sharing.
  • Crop ImageCrop an image to any rectangle in your browser. Drag to select, download instantly. Free, private.
  • Meme GeneratorCreate memes by uploading a photo and adding top/bottom text. Customise font size, colour, and stroke. Download as PNG. Everything runs in your browser — no upload to a server.
  • Image WatermarkAdd a text watermark to any JPEG, PNG, or WebP image in your browser. Choose position, size, and opacity. No upload — your image is processed locally and downloaded directly.
  • Image Flip & RotateFlip and rotate JPEG, PNG, or WebP images in your browser. Horizontal flip, vertical flip, 90°/180°/270° rotation. No upload, no account.
  • Image UpscalerUpscale any image 2×, 3×, or 4× using browser-native interpolation. Free, no upload, instant.
  • Background RemoverRemove image backgrounds by color selection. Click the background color, adjust tolerance, download transparent PNG. Free, no upload.
  • Photo EditorEdit photos in your browser: adjust brightness, contrast, saturation, blur, grayscale, sepia, and more. Free, no upload.
  • GIF MakerTurn 2–10 images into an animated GIF. Set frame delay, max size, download instantly. Free, in-browser.
  • Photo Collage MakerCreate photo collages with 2–6 images in grid layouts. Free, in-browser, download as PNG.
  • Image to TextExtract visible text from an image using browser-native text detection when available. No upload, no OCR API.

Finance

  • VAT CalculatorCalculate VAT for any EU rate. Add or remove VAT instantly. Free, private, no signup.
  • Compound Interest CalculatorCalculate how investments grow with compound interest. Annual, quarterly, monthly, and more.
  • Mortgage CalculatorCalculate your monthly mortgage payment, total repayment, and total interest. Free, private.
  • Loan / EMI CalculatorCalculate monthly loan payments (EMI), total interest, and total repayment. Free, private, instant.
  • FIRE CalculatorCalculate your FIRE number and how many years to financial independence. Free, private, no signup.
  • Percentage CalculatorFind X% of Y, add or subtract percentages, or calculate percentage change. Free, instant.
  • Tip CalculatorCalculate tip amount and split the bill between any number of people. Free, instant.
  • Business Name GeneratorGenerate brandable business name ideas from your keywords. Free, instant, private — runs entirely in your browser.

Developer Tools

  • .gitignore GeneratorGenerate a .gitignore file by selecting technology presets — Node, Python, macOS, Windows, VS Code, and more. Deduplicates entries. Copy or download instantly.
  • README GeneratorGenerate a professional README.md from a simple form — project name, description, features, installation, and licence. Copy the Markdown instantly. No account, no upload.
  • Random Number GeneratorGenerate cryptographically secure random integers or decimals. Set range, count, and unique-only — all in your browser.
  • Username GeneratorGenerate creative, memorable usernames from adjective-noun combinations. Choose your style, separator, and count. Runs in your browser — no account, no tracking.
  • JSON FormatterFormat and validate JSON in your browser. Instantly pretty-print with 2 or 4 space indent.
  • JWT DecoderDecode and inspect JSON Web Token header and payload in your browser. No signature data leaves your device.
  • Base64 Encoder / DecoderEncode text to Base64 or decode Base64 back to text. Runs entirely in your browser.
  • URL Encoder / DecoderEncode special characters for URLs or decode percent-encoded strings. Instant, private.
  • HTML Entity Encoder / DecoderEncode special characters to HTML entities or decode entities back to text — instantly, in your browser.
  • UUID GeneratorGenerate cryptographically secure v4 UUIDs in your browser. Bulk generate up to 25 at once.
  • Password GeneratorGenerate strong, random passwords in your browser. Customise length and character sets.
  • Color ConverterConvert colors between HEX, RGB, and HSL. Instant, private, runs in your browser.
  • Hash GeneratorGenerate SHA-256, SHA-512, SHA-1, and SHA-384 hashes from text. Runs in your browser.
  • CSV to JSONConvert CSV (or Excel/Sheets exports) to a JSON array of objects. Handles quoted fields. Free, private.
  • JSON to CSVConvert a JSON array of objects to CSV (Excel/Sheets ready). Handles nested values and quoting. Free, private.
  • YAML ↔ JSON ConverterConvert YAML to JSON or JSON to YAML instantly in your browser. Supports nested structures, arrays, and custom indentation.
  • XML Formatter & MinifierFormat and pretty-print XML with custom indentation, or minify it to a single line — all in your browser.
  • Number Base ConverterConvert numbers between binary, octal, decimal, and hexadecimal. Free, private, instant.
  • Regex TesterTest regular expressions against text. See all matches highlighted with position. Runs in your browser.
  • Crontab GeneratorBuild and explain cron expressions field by field. Presets, live preview, plain-English description. Free, private.
  • QR Code GeneratorGenerate a QR code from any text or URL and download it as PNG. Free, private, runs in your browser.
  • CSS Grid GeneratorBuild CSS Grid layouts visually — set columns, rows, gaps, and units, then copy the generated CSS. Runs in your browser, no account required.
  • CSS Flexbox GeneratorBuild CSS Flexbox layouts visually — toggle direction, wrap, justify-content, and alignment, then copy the generated CSS. Runs in your browser, no account required.
  • Fake Data GeneratorGenerate rows of realistic test data — names, emails, addresses, UUIDs, and more. Export as CSV. Runs in your browser via @faker-js/faker, nothing is uploaded.
  • Domain Name GeneratorGenerate domain name ideas from your keywords across popular TLDs. Free, instant, private — runs in your browser.
  • SQL FormatterFormat and pretty-print SQL queries in your browser. Uppercase keywords, indent clauses, instant output. No upload, no account.
  • JSON to TypeScriptConvert JSON objects to TypeScript interfaces instantly in your browser. Nested objects become nested interfaces. No upload, no account, no tracking.
  • File Checksum VerifierCompute SHA-256, SHA-512, or SHA-1 hash of any file in your browser. Verify against an expected checksum. No upload — your file never leaves your device.
  • HTML to MarkdownConvert HTML to Markdown in your browser. Supports headings, lists, links, images, code blocks, and more. No upload, no account, no tracking.
  • Barcode GeneratorGenerate Code 128 barcodes from any text in your browser. Download as PNG. No upload, no account, no tracking.
  • CSS Gradient GeneratorCreate linear, radial, and conic CSS gradients with a live preview. Copy the CSS instantly. Free, runs in your browser.
  • Base64 Image EncoderConvert any image to a Base64 data URL in your browser. Copy the string for HTML, CSS, or JSON. Free, no upload.
  • String Escape ToolEscape and unescape strings for JSON, HTML, SQL, Regex, and URL encoding. Free, runs in your browser.
  • LLM Benchmark ComparisonCompare Claude, GPT-4o, Gemini, Llama and more on MMLU, HumanEval, MATH, GPQA and pricing. Sortable table.
  • Favicon GeneratorConvert any image to favicon PNG files in all standard sizes (16px to 512px). Free, no upload.
  • LLM Cost CalculatorCalculate and compare LLM API costs for Claude, GPT-4o, Gemini, Llama and more. Enter token counts to see exact pricing.
  • Token CounterCount tokens, words, and characters in any text. See how your text fits in Claude, GPT-4o, or Gemini context windows.
  • JSON Schema GeneratorPaste any JSON and instantly generate a JSON Schema (draft-07). Free, instant, no upload.
  • Code FormatterFormat and beautify JSON, CSS, HTML, and SQL code instantly. Free, in-browser, no upload.
  • HTTP Headers DecoderPaste HTTP response headers to decode and understand each one. Covers security, caching, CORS and content headers.
  • Prompt FormatterConvert system and user messages into OpenAI, Claude, Gemini, or Llama API format. Copy-paste ready JSON.
  • Tokenizer VisualizerVisualize how your text is split into tokens for LLMs. See approximate token boundaries with color-coded highlights.
  • RAG Chunk PreviewerPreview how your documents will be chunked for RAG (Retrieval-Augmented Generation). Adjust chunk size and overlap.
  • JWT GeneratorGenerate signed JWT tokens with HS256, HS384, or HS512. Add custom claims, set expiry, copy the token. Free, in-browser.
  • JSONL Formatter & ValidatorValidate JSONL files line by line and convert between JSONL and JSON array. Free, in-browser.
  • LLM Error DecoderDecode LLM API errors from OpenAI, Anthropic, Gemini, and Groq. Get causes and fixes instantly.
  • LLM Memory CalculatorCalculate how much VRAM you need to run any LLM. Covers fp32, fp16, int8, int4 quantization and KV cache.
  • Context Window VisualizerSee how your prompt fills different LLM context windows. Compare Claude, GPT-4o, Gemini across 9 models.
  • Prompt Injection ScannerScan user inputs for common prompt injection patterns before sending to your LLM. Free, in-browser.
  • System Prompt ScorerScore your LLM system prompt on 7 dimensions: role, task clarity, constraints, format, tone, context, and examples.
  • Few-Shot Prompt BuilderBuild few-shot example collections for LLM prompts. Format for OpenAI, Claude, or plain text.
  • Text Similarity CheckerCompare two texts for lexical similarity using cosine similarity. Fast, in-browser, no API key.
  • Fine-Tune Cost CalculatorEstimate fine-tuning training tokens, training cost, and monthly inference cost from editable provider rates.
  • Token Probability VisualizerConvert candidate token logits into softmax probabilities and see how temperature changes model sampling.
  • LLM Response ComparatorCompare two LLM outputs by tokens, words, shared terms, and lexical cosine similarity. No API key.
  • Context PackerPack prioritized prompt blocks into a context-window budget while reserving output tokens.
  • Prompt CompressorTrim whitespace, comments, and filler phrases from prompts to reduce approximate token count before sending to an LLM.
  • LLM Eval ScorecardScore LLM outputs manually across accuracy, completeness, instruction following, safety, and clarity.

Text Tools

  • Word CounterCount words, characters, sentences, and reading time. Instant results as you type.
  • Text Case ConverterConvert text between UPPER, lower, Title, Sentence, camelCase, PascalCase, snake_case, and kebab-case.
  • Markdown to HTMLConvert Markdown to HTML with live preview. Runs entirely in your browser.
  • Diff CheckerCompare two blocks of text and see added, removed, and unchanged lines. Free, private, instant.
  • Remove Duplicate LinesRemove duplicate lines from text, with optional case-insensitive and trim matching. Free, private, instant.
  • Sort LinesSort lines of text alphabetically, numerically, or by length. Reverse, deduplicate, and ignore case — all in your browser.
  • Slug GeneratorConvert any text into a URL-friendly slug. Strip diacritics, choose separator, set max length — all in your browser.
  • Find & ReplaceFind and replace text with regex or plain-text matching. Case-sensitive, whole-word, and global options — all in your browser.
  • Lorem Ipsum GeneratorGenerate placeholder Latin text by paragraph or word count. Instant, free, no account needed.
  • Markdown Table GeneratorConvert CSV, Excel, or Google Sheets data into a Markdown table for GitHub, Notion, Reddit, and Slack. Free, private.
  • Number to WordsConvert any number to English words instantly. Free, runs in your browser.
  • Readability ScoreCheck your text's Flesch Reading Ease and Flesch-Kincaid grade level instantly. Free, in-browser.
  • Word Cloud GeneratorGenerate a word cloud from any text. Frequency-based sizing, no upload, free.
  • Speech to TextConvert your voice to text using your browser's built-in speech recognition. Free, no upload, no API key.
  • Text to SpeechRead text aloud with your browser voice engine. Choose voice, rate, and pitch. No account, no Brevio server processing.

Converters

  • Unit ConverterConvert between length, weight, temperature, volume, and speed units. Instant, private, free.
  • Age CalculatorCalculate exact age in years, months, and days between two dates. Free, private, instant.
  • Time Zone ConverterConvert a date and time across world time zones. Free, private, runs entirely in your browser.
  • Unix Timestamp ConverterConvert Unix timestamps to human-readable dates and back. Seconds or milliseconds, UTC and local. Free, private.

Health

  • BMI CalculatorCalculate your Body Mass Index from height and weight. Metric and imperial. Free, private.
  • Calorie CalculatorEstimate daily calorie needs (BMR and TDEE) using the Mifflin-St Jeor formula. Free, private.
  • Body Fat CalculatorEstimate body fat percentage using the US Navy method. Enter height, waist, neck (and hip for women) — no equipment needed.

Games

  • Typing Speed TestTest your typing speed and accuracy. Free, instant, no sign-up.
  • Reaction Time TestMeasure your reaction time in milliseconds. Free, instant, no sign-up.
  • CPS TestCount your clicks per second. 5, 10, or 15-second modes. Free, instant.
  • Memory TestTest your short-term memory by repeating tile sequences. Free, instant.
  • Color Vision TestFind the odd-coloured circle in each round. Tests colour discrimination. Free, instant.
  • Number MemoryRemember longer and longer sequences of digits. Free, instant.
  • Aim TrainerClick targets as fast as possible. Measures aim speed and accuracy. Free, instant.
  • 2048Slide and merge tiles to reach 2048. Free, runs in your browser.
  • LexioGuess the 6-letter word in 6 tries. Free, unlimited plays.

Time

  • Stopwatch & Countdown TimerA precise stopwatch and countdown timer that runs in your browser. No install, no account.
  • Pomodoro TimerA customizable Pomodoro timer with work/break cycles, session tracking, and audio alerts. No account needed.

Design Tools

  • Color Palette GeneratorGenerate harmonious color palettes from a base color using complementary, analogous, triadic, and other color theory modes. No upload, no account — runs in your browser.
  • Business Card GeneratorDesign a business card and download a print-ready PNG. Free, private — runs entirely in your browser.
  • Certificate GeneratorCreate a printable certificate PDF in your browser. Free, private, no signup.
  • Aspect Ratio CalculatorCalculate aspect ratios and scale dimensions while maintaining proportions. Supports 16:9, 4:3, 1:1, and custom ratios. No upload, instant results.
  • Signature MakerDraw and download a digital signature as a PNG. Free, runs entirely in your browser — your signature never leaves your device.
  • Thumbnail MakerCreate YouTube thumbnails and social media images in your browser. Add text, background color or image. Free, no upload.
  • Chart MakerCreate bar charts, line charts, and pie charts from your data. Free, in-browser, download as PNG.
  • Banner MakerCreate social media banners for Twitter/X, LinkedIn, Facebook, YouTube, and GitHub. Free, in-browser.
  • Poster MakerCreate event posters, flyers, and social media stories. A4, A3, Letter, Instagram Story formats. Free, in-browser.
  • Invitation MakerDesign digital invitations for weddings, parties, and events. Square, A5, 5×7 formats. Free, in-browser.
  • Video CompressorCompress videos in your browser using Canvas + MediaRecorder. Output as WebM. Free, no upload.
  • Flowchart MakerBuild flowcharts with process, decision, and I/O nodes. Download as SVG or PNG. Free, in-browser.
  • Mind Map MakerCreate visual mind maps with a central topic, branches, and sub-topics. Download as PNG. Free, in-browser.
  • Logo MakerCreate simple logos with icon, text, and shapes. Customize colors and fonts. Free, in-browser, download PNG.
  • Audio TrimmerTrim any audio file to a specific start and end time. Download as WAV. Free, no upload, runs in browser.
  • Screen RecorderRecord your screen directly in the browser. No download, no account. Save as WebM video.

Career Tools

  • Cover Letter GeneratorBuild a professional cover letter from a few details. Free, private, no signup — runs entirely in your browser.
  • Resume GeneratorBuild a professional resume and download a print-ready PDF. Free, private, no signup — runs entirely in your browser.

Crypto Tools

  • Ethereum Address ValidatorValidate Ethereum addresses and generate EIP-55 checksums instantly. Free, private, no upload.
  • APY ↔ APR CalculatorConvert between APR and APY with any compounding frequency. See how compounding frequency affects yield instantly. Free, private.
  • DCA CalculatorSimulate dollar-cost averaging investments. Plan recurring purchases, track cumulative cost basis, and visualize your DCA schedule over time. Purely illustrative — no price data.
  • Satoshi / BTC ConverterConvert between satoshi, bits, mBTC, and BTC instantly. Optionally enter a BTC price to see USD value. Everything runs in your browser.
  • ETH Unit ConverterConvert between wei, kwei, mwei, gwei, szabo, finney, and ETH. Optionally add a price for USD value. Client-side, private.
  • Bitcoin Address ValidatorValidate Bitcoin addresses in your browser. Supports P2PKH, P2SH, Bech32, and Taproot. Checksum verified locally — address never leaves your device.
  • Staking Rewards CalculatorEstimate staking rewards over any period. Enter stake amount, APY, and compound frequency to see total rewards and month-by-month growth.
  • Crypto Tax P&L CalculatorCalculate realized crypto gains using FIFO cost basis. Enter buy and sell transactions, get short-term vs. long-term P&L, and export to CSV. Not tax advice.
  • Portfolio RebalancerEnter your current holdings and target allocations to see what to buy or sell to rebalance. Calculates drift and required trades. Runs in your browser.
  • Crypto Payment QR GeneratorGenerate Bitcoin, Ethereum, Solana, or Litecoin payment QR codes using standard URI schemes (BIP-21, EIP-681). Download as PNG. Runs in your browser.
  • Crypto Denomination ReferenceReference table for Bitcoin (satoshi → BTC), Ethereum (wei → ETH), and Solana (lamport → SOL) units. Optionally enter a price to see USD values.
  • BIP39 Seed Phrase ValidatorValidate 12 or 24-word BIP39 seed phrases. Check each word against the official wordlist, validate checksums, and get suggestions for typos. Runs entirely in your browser.
  • Text EncryptorEncrypt and decrypt text using AES-256-GCM with PBKDF2 key derivation, entirely in your browser. No upload, no server, no account — your text and password never leave your device.
More free toolsSee all 162 →
Merge PDFsCompress ImageJSON FormatterPassword GeneratorVAT CalculatorQR Code Generator