# SolveBar > SolveBar is a free online toolbox for developers and crypto users. It offers 85+ browser-based tools across categories including developer utilities, blockchain/crypto tools, finance calculators, productivity apps, PDF tools, and image editors. No account required, no data sent to servers — everything runs locally in the browser. ## Home - [SolveBar Home](https://solvebar.com/): Full directory of all 85+ free tools. ## General Tools - [Unit Converter](https://solvebar.com/tools/unit-converter): Convert length, weight, temperature, area, volume and more. - [Percentage Calculator](https://solvebar.com/tools/percentage-calculator): Calculate percentages, increases, decreases and ratios. - [Word & Character Counter](https://solvebar.com/tools/word-counter): Count words, characters, sentences and reading time. - [Password Generator](https://solvebar.com/tools/password-generator): Generate strong, secure random passwords instantly. - [BMI Calculator](https://solvebar.com/tools/bmi-calculator): Calculate Body Mass Index and healthy weight range. - [Currency Converter](https://solvebar.com/tools/currency-converter): Live exchange rates for 150+ currencies. - [QR Code Generator](https://solvebar.com/tools/qr-code-generator): Generate and scan QR codes for URLs, text, WiFi and more. - [Scientific Calculator](https://solvebar.com/tools/scientific-calculator): Full scientific calculator with formula history. - [Color Palette Generator](https://solvebar.com/tools/color-palette): Generate harmonious palettes and convert color formats. - [Chart Builder](https://solvebar.com/tools/chart-builder): Build bar, line, pie and scatter charts from CSV data. - [Resume / CV Builder](https://solvebar.com/tools/resume-builder): Build a professional resume and export as PDF, free. - [Typing Speed Test](https://solvebar.com/tools/typing-speed-test): Test typing speed in WPM with accuracy tracking. - [Barcode Generator](https://solvebar.com/tools/barcode-generator): Generate barcodes in CODE128, EAN-13, QR and more. - [Certificate Generator](https://solvebar.com/tools/certificate-generator): Design and generate printable certificates as PDF. ## Developer Tools - [JSON Formatter & Validator](https://solvebar.com/tools/json-formatter): Format and validate JSON securely offline in your browser. - [Base64 Encoder / Decoder](https://solvebar.com/tools/base64-encoder): Encode and decode Base64 strings instantly. - [Hash Generator](https://solvebar.com/tools/hash-generator): Generate MD5, SHA-1, SHA-256 and SHA-512 hashes. - [Unix Timestamp Converter](https://solvebar.com/tools/unix-timestamp-converter): Convert Unix timestamps to human-readable dates. - [Code Diff Checker](https://solvebar.com/tools/diff-checker): Compare two blocks of text or code and highlight differences. - [Regex Tester](https://solvebar.com/tools/regex-tester): Test regular expressions with live match highlighting. - [JWT Decoder](https://solvebar.com/tools/jwt-decoder): Decode and inspect JWT tokens — header, payload and expiry. - [Cron Expression Generator](https://solvebar.com/tools/cron-generator): Build cron expressions visually and see them in plain English. - [Mock Data Generator](https://solvebar.com/tools/fake-data-generator): Generate fake users, IPs, UUIDs, credit cards, and custom JSON. - [SQL Formatter](https://solvebar.com/tools/sql-formatter): Format and beautify SQL queries with dialect support. - [CSV ↔ JSON Converter](https://solvebar.com/tools/csv-json-converter): Convert CSV to JSON and JSON to CSV with live preview. - [XML / HTML Formatter](https://solvebar.com/tools/xml-formatter): Format, validate and minify XML and HTML. - [Code Snippet Manager](https://solvebar.com/tools/code-snippet-manager): Save, organize and search code snippets with syntax highlighting. - [Markdown Editor](https://solvebar.com/tools/markdown-editor): Full markdown editor with live preview and document library. - [Favicon Generator](https://solvebar.com/tools/favicon-generator): Generate favicon.ico and PNG icons in all sizes from any image. ## Blockchain & Crypto Tools - [ETH Gas Tracker](https://solvebar.com/tools/eth-gas-tracker): Live Ethereum gas prices — slow, standard and fast. - [Crypto P&L Calculator](https://solvebar.com/tools/crypto-pnl-calculator): Calculate crypto profit and loss from any trade. - [Wei / Gwei / ETH Converter](https://solvebar.com/tools/eth-unit-converter): Convert between Wei, Gwei and ETH instantly. - [ABI Decoder / Encoder](https://solvebar.com/tools/abi-decoder): Decode and encode Ethereum ABI data for smart contracts. - [Wallet Age Checker](https://solvebar.com/tools/wallet-age-checker): Check how old any Ethereum wallet address is. - [Crypto Tax Calculator](https://solvebar.com/tools/crypto-tax-calculator): Estimate capital gains tax on crypto trades, no sign-up. - [Crypto Portfolio Tracker](https://solvebar.com/tools/crypto-portfolio): Track crypto holdings with live prices and P&L. - [Crypto Watchlist](https://solvebar.com/tools/crypto-watchlist): Watch live crypto prices with custom target alerts. - [DCA Calculator](https://solvebar.com/tools/dca-calculator): Calculate returns from dollar cost averaging into any crypto. - [Crypto Fear & Greed Index](https://solvebar.com/tools/fear-greed-index): Live crypto market sentiment indicator. - [Crypto Staking Calculator](https://solvebar.com/tools/crypto-staking-calculator): Calculate staking rewards and APY returns. - [Liquidation Price Calculator](https://solvebar.com/tools/liquidation-calculator): Calculate liquidation price for leveraged crypto positions. - [Smart Contract Reader](https://solvebar.com/tools/contract-reader): Interact with any smart contract using its ABI. - [Solana Transaction Decoder](https://solvebar.com/tools/solana-tx-decoder): Decode any Solana transaction into human-readable instructions. - [Multi-Wallet Balance Checker](https://solvebar.com/tools/multi-wallet-checker): Check token balances across multiple wallets. - [BIP39 Mnemonic Generator](https://solvebar.com/tools/bip39-generator): Generate and validate BIP39 mnemonic seed phrases offline. ## Finance Tools - [GST / VAT Calculator](https://solvebar.com/tools/gst-calculator): Add or remove GST and VAT from any amount. - [ROI Calculator](https://solvebar.com/tools/roi-calculator): Calculate return on investment for any investment. - [Inflation Calculator](https://solvebar.com/tools/inflation-calculator): See how inflation erodes purchasing power over time. - [Loan / EMI Calculator](https://solvebar.com/tools/loan-calculator): Calculate monthly EMI, total interest and repayment schedule. - [Budget Tracker](https://solvebar.com/tools/budget-tracker): Track income and expenses by category with monthly overview. - [Net Worth Tracker](https://solvebar.com/tools/net-worth-tracker): Track assets and liabilities to calculate net worth. - [Compound Interest Calculator](https://solvebar.com/tools/compound-interest): See how investments grow over time with compound interest. - [Mortgage Calculator](https://solvebar.com/tools/mortgage-calculator): Calculate mortgage payments with amortization chart. - [Invoice Generator](https://solvebar.com/tools/invoice-generator): Create professional invoices and download as PDF. - [Receipt Generator](https://solvebar.com/tools/receipt-generator): Generate professional receipts and download as PDF. ## Productivity Tools - [Pomodoro Timer](https://solvebar.com/tools/pomodoro-timer): Focus timer with 25/5 sessions, streaks and daily history. - [Todo List](https://solvebar.com/tools/todo-list): Clean todo list with priorities, due dates and local storage. - [Quick Notes](https://solvebar.com/tools/quick-notes): Instant notes with multiple tabs, auto-save and markdown support. - [Habit Tracker](https://solvebar.com/tools/habit-tracker): Track daily habits with streaks, heatmap and completion history. - [Kanban Board](https://solvebar.com/tools/kanban-board): Drag-and-drop Kanban board saved in your browser. - [Flashcard Study Tool](https://solvebar.com/tools/flashcard-tool): Create flashcard decks with spaced repetition and progress tracking. ## PDF Tools - [PDF to Images](https://solvebar.com/tools/pdf-to-images): Convert PDF pages to PNG or JPG images. - [PDF Merger](https://solvebar.com/tools/pdf-merger): Combine multiple PDF files into one. - [PDF Splitter](https://solvebar.com/tools/pdf-splitter): Split a PDF into individual pages or page ranges. - [PDF Compressor](https://solvebar.com/tools/pdf-compressor): Reduce PDF file size without losing quality. - [PDF to Text Extractor](https://solvebar.com/tools/pdf-to-text): Extract all text content from any PDF. - [PDF Page Rotator](https://solvebar.com/tools/pdf-rotator): Rotate PDF pages 90, 180 or 270 degrees. - [PDF Watermark](https://solvebar.com/tools/pdf-watermark): Add text or image watermarks to PDF pages. - [PDF Metadata Editor](https://solvebar.com/tools/pdf-metadata): View and edit PDF metadata. - [PDF Page Reorder](https://solvebar.com/tools/pdf-page-reorder): Drag and drop to reorder pages in a PDF. - [PDF Form Filler](https://solvebar.com/tools/pdf-form-filler): Fill in PDF form fields and download the completed form. - [PDF Canvas Builder](https://solvebar.com/tools/pdf-builder): Build PDFs from scratch with a drag-and-drop canvas. - [Markdown to PDF](https://solvebar.com/tools/markdown-to-pdf): Convert Markdown text to a styled PDF document. - [HTML to PDF](https://solvebar.com/tools/html-to-pdf): Convert any HTML page or snippet to a PDF document. ## Image Tools - [Image Compressor](https://solvebar.com/tools/image-compressor): Compress images to reduce file size without losing quality. - [Image Resizer](https://solvebar.com/tools/image-resizer): Resize images to exact dimensions or by percentage. - [Image Cropper](https://solvebar.com/tools/image-cropper): Crop images with freeform or fixed aspect ratio selection. - [Image Format Converter](https://solvebar.com/tools/image-converter): Convert images between JPG, PNG, WebP and GIF. - [Image to Base64](https://solvebar.com/tools/image-to-base64): Convert images to Base64 strings for use in HTML and CSS. - [EXIF Metadata Viewer](https://solvebar.com/tools/exif-viewer): View hidden metadata inside photos — camera, GPS, settings. - [Color Picker from Image](https://solvebar.com/tools/color-picker-image): Pick any color from an uploaded image and get HEX, RGB, HSL. - [Image Filters & Effects](https://solvebar.com/tools/image-filters): Apply filters — brightness, contrast, blur, grayscale and more. - [Image Watermark](https://solvebar.com/tools/image-watermark): Add text or image watermarks to your photos. - [SVG to PNG Converter](https://solvebar.com/tools/svg-to-png): Convert SVG files to PNG at any resolution. - [Image Diff Checker](https://solvebar.com/tools/image-diff): Compare two images and highlight pixel differences. ## Blog - [Blog Home](https://solvebar.com/blog): Articles on developer privacy, security and browser-based tools. - [Laid Off in Tech? How to Work Out How Long Your Savings Will Last](https://solvebar.com/blog/laid-off-in-tech-how-long-will-savings-last): Tech firms announced 155,126 US job cuts by August 2026. Use this runway formula and three worked… - [Only 4.5% of Software Jobs Are Entry-Level. How Juniors Still Get Hired in 2026](https://solvebar.com/blog/entry-level-software-jobs-2026-junior-developers): Only 4.5% of software job postings were entry-level in early 2026. What Indeed, Stanford and NY Fed… - [7 Things to Know Before You Pay for AI (How I Stay Under My Limits)](https://solvebar.com/blog/7-things-to-know-before-you-pay-for-ai): AI plans are billed in tokens, not questions. Seven things that decide how fast you hit your limit —… - [How to Calculate DCA Average Price for Bitcoin (Step-by-Step with Formula)](https://solvebar.com/blog/how-to-calculate-dca-average-price-bitcoin): Learn the exact formula to calculate your Bitcoin DCA average price. Use our free, private local… - [BIP39 Explained: How 12 Words Control Millions (And Why You Must Never Type Them Online)](https://solvebar.com/blog/bip39-explained-seed-phrase-security): BIP39 seed phrases are the master key to every wallet in your crypto portfolio. Learn how they work and… - [JWT Decoder: What's Inside Your JSON Web Token (And Why Pasting It Online Is a Security Breach)](https://solvebar.com/blog/how-to-decode-jwt-token-safely): Learn how to decode a JWT token, understand its three parts, and why using a cloud-based decoder exposes… - [Solana vs Ethereum Staking: Which Chain Pays More in 2026?](https://solvebar.com/blog/solana-vs-ethereum-staking-calculator-2026): Compare Solana and Ethereum staking returns in 2026. Current APY rates, validator risks, and a private… - [How to Compress a PDF Without Losing Quality (Browser-Based, Zero Upload)](https://solvebar.com/blog/compress-pdf-without-losing-quality): Compress large PDF files without quality loss and without uploading to a cloud server. Our local… - [Crypto Portfolio Tracker vs Spreadsheet: Which Is More Private in 2026?](https://solvebar.com/blog/crypto-portfolio-tracker-privacy-risk-2026): Apps like CoinStats and Delta link your wallet addresses to your identity and sell behavioural data. Learn… - [What Is a Crypto Staking Reward and How Is It Taxed? (2026 Guide)](https://solvebar.com/blog/crypto-staking-tax-guide-2026): Staking rewards are taxable as ordinary income in most jurisdictions. Learn how staking income is… - [How to Format and Validate JSON Privately (Without Pasting Into a Cloud Tool)](https://solvebar.com/blog/json-formatter-private-no-upload): Pasting JSON into a cloud formatter sends your API payloads, config files, and secrets to a third-party… - [Why AI Coding Assistants Are Leaking Your Proprietary Code (And How to Stop It)](https://solvebar.com/blog/why-ai-coding-assistants-are-leaking-your-proprietary-code-2026): 92% of AI-generated code contains critical vulnerabilities. Learn why GitHub Copilot, ChatGPT, and Cursor… - [The PDF Metadata Privacy Nightmare: What Your Resume is Really Telling Employers](https://solvebar.com/blog/pdf-metadata-hidden-privacy-nightmare-2026): Your PDF resume contains hidden metadata revealing your work location, software version, edit history, and… - [How to Verify Wallet Age and Why it Matters for Airdrop Eligibility (2026)](https://solvebar.com/blog/verify-wallet-age-airdrop-eligibility-2026): Don't get filtered as a Sybil. Learn why wallet age is the #1 metric for 2026 airdrops, how to check your… - [How to Batch Convert JPG to WebP for Better Core Web Vitals (2026 Guide)](https://solvebar.com/blog/how-to-batch-convert-jpg-to-webp-for-core-web-vitals): Improve your Largest Contentful Paint (LCP) by switching to WebP. Learn how to batch convert images… - [Why Browser-Based Tools are the Future of Developer Privacy in 2026](https://solvebar.com/blog/why-browser-based-tools-are-the-future-of-privacy-2026): Discover why 2026 is the year of local-first developer tools. Learn how the Web Crypto API and Canvas API… - [Ethereum Gas Fees Forecast: What to Expect in April 2026 & How to Save](https://solvebar.com/blog/eth-gas-fees-explained-save-money-2026): Don't overpay for Ethereum transactions. Learn how gas fees are calculated in 2026, the best times to… - [How to Protect Your Images: Adding Watermarks Without Uploading to a Server in 2026](https://solvebar.com/blog/how-to-protect-images-watermark-without-uploading): Stop uploading your original photos to cloud tools just to watermark them. Learn how to protect your… - [10 Things You Should Know Before Entering Crypto (Lessons From 10 Years of Real Losses)](https://solvebar.com/blog/10-things-you-should-know-before-entering-crypto-2026): Ten years in crypto, ten hard lessons: volatility, lost keys, exchange collapses, scams, and taxes —… - [Bitcoin Price Swings and the Exact Move That Liquidates a Leveraged Position](https://solvebar.com/blog/bitcoin-liquidation-price-leverage-risk-2026): See the real liquidation formula behind leveraged Bitcoin trading: exact liquidation distance by… - [PDF Watermark: Stamp CONFIDENTIAL, DRAFT, or Your Logo Onto Any PDF — Live Preview, No Upload](https://solvebar.com/blog/pdf-watermark-tool-guide-confidential-draft-stamp): Add a text or logo watermark to a PDF entirely in your browser, with a real live preview rendered from… - [How to Build a Resume That Actually Gets Read (Free CV Builder, No Signup)](https://solvebar.com/blog/how-to-build-an-ats-friendly-resume-free-cv-builder): Most resumes never reach a human — they get filtered by an ATS first. Here's how to build one that… - [Free Invoice Generator: Simple Mode for One-Off Invoices, Advanced for Everything Else](https://solvebar.com/blog/free-invoice-generator-simple-vs-advanced-mode): One tool, two ways to work: a one-screen invoice generator for a quick one-off bill, and a full… - [ABI Decoder/Encoder: Read Any Calldata, Build Any Function Call, Right in Your Browser](https://solvebar.com/blog/abi-decoder-encoder-guide-selector-calldata): Decode raw Ethereum calldata into readable parameters, or build calldata from a function signature and… - [Multi-Wallet Balance Checker: Every Wallet, Four Chains, One Dashboard](https://solvebar.com/blog/multi-wallet-checker-track-balances-across-chains): Save a flat list of wallet addresses once, then check native and token balances across Ethereum, BNB… ## Legal & Info - [About](https://solvebar.com/about/): About SolveBar and its mission. - [Privacy Policy](https://solvebar.com/privacy): How SolveBar handles user data (spoiler: it doesn't collect any). - [Terms of Service](https://solvebar.com/terms): Terms of use. - [Sitemap](https://solvebar.com/sitemap.xml): Full XML sitemap. ## Optional: Pages to skip - [Disclaimer](https://solvebar.com/disclaimer): Legal disclaimer page. - [DMCA](https://solvebar.com/dmca): DMCA policy page.