Popular Tools

Online image compressor for JPG/PNG/WEBP/GIF/AVIF/HEIC with 3 quality levels, batch processing, real-time ratio display. Files auto-deleted after 2 hours.

Browser PDF editor for text, highlight, shapes, pen, eraser annotations. Built on pdf-lib + PDF.js, no upload, with undo, zoom, and thumbnail navigation.

GeekFormat free online JSON Formatter tool. Supports JSON beautification, validation, minification, and structure viewing. Built-in syntax error detection and auto-repair. Supports code conversion to 13 programming languages (TypeScript/Java/Python/Go, etc.). Ideal for API debugging, configuration inspection, and log reading.

Free online 2-in-1 QR Code generator and Barcode generator, supporting 9 QR Code types (URL/WiFi/vCard/SMS/Phone/Email/Geolocation/Calendar Event/Text) and 6 barcode formats (CODE128/EAN-13/UPC etc.), customizable colors, styles and Logo, batch generation with ZIP download, pure frontend generation with no data upload.

Free online URL parser. Break down protocol, domain, port, path, query parameters, and anchor one by one. Support parameter decoding. Perfect for link troubleshooting and API debugging.

Free online JWT workbench: decode, verify, and generate JSON Web Tokens in one place. Supports 13 algorithms (HS256/HS384/HS512, RS256/RS384/RS512, ES256/ES384/ES512, PS256/PS384/PS512, EdDSA). Both PEM and JWK keys. Auto-generates key pairs. Decodes exp/iat/nbf claims. 100% client-side Web Crypto — token never leaves your browser.

Free unit converter: 36 tools—length, weight, °C/°F, area, volume, hp, psi/bar. Metric/Imperial/Chinese. Quick here or dedicated pages. No signup, private.

Compress PDF files for free directly in your browser with no server upload. Choose Light, Recommended, or Extreme mode to shrink attachments, upload-ready files, scanned PDFs, and mobile-friendly documents.

Edit images online with text, arrows, shapes, pixel redaction, crop, and resize. Files stay in your browser, then export a clean PNG for free.

Free online JSON Schema validation tool supporting Draft 4/6/7/2019-09/2020-12 specifications. Validate JSON data in real-time with precise JSON Pointer error location, detailed field-level error messages, $ref resolution, if/then/else conditional validation, anyOf/oneOf/allOf combinatorial logic and other advanced features. No registration required, runs locally in your browser with zero data upload.

Free online currency converter with real-time exchange rates. Convert USD, EUR, GBP, and more instantly. Perfect for travel, cross-border shopping, and international payments.

Free online Base64 encode/decode tool with UTF-8/ASCII/ISO-8859-1, Standard/URL-Safe/MIME variants. Real-time overhead and RFC 2045 wrapping. Runs locally.

Free online tool to view your current public IP address. Automatically detects IPv4, IPv6, geolocation, ISP, and request header information. See your IP instantly on page load. Supports command-line queries via curl, PowerShell, Python, and more. Ideal for whitelist configuration, proxy troubleshooting, remote connections, and network diagnostics — no installation required.

Free online AWG wire gauge converter with voltage drop calc, NEC ampacity tables, skin effect calculator, and quick lookup for electricians.

Free online JSON compression tool. One-click minify formatted JSON into compact single-line format. Supports JSON Escape/Unescape, built-in smart syntax repair (trailing commas, single quotes, etc.), real-time compression ratio display, pure frontend processing with no data upload, keyboard shortcuts supported.

Convert images entirely in your browser with zero server uploads. Supports 20 input formats including HEIC, RAW (CR2/NEF/ARW), PSD, PDF, AVIF, WebP. Outputs JPG, PNG, WebP, GIF, ICO, BMP. Private and secure.

Convert JPG/PNG/WEBP to multi-page PDF online. 3 sizes (A4/Letter/Original), 4 margins, contain/cover. Local pdf-lib processing, no upload, no watermark.

Free online IP address geolocation lookup, ASN, ISP, timezone and network properties. Supports both IPv4 and IPv6 dual-stack, includes popular preset IPs and recent query history. Backend real-time GeoIP database queries, ideal for log auditing, risk control analysis, suspicious access tracing and network operations troubleshooting.

All-in-one online time tool: global world clock with flags + SVG analog clocks + day/night indicators, bidirectional Unix timestamp conversion (seconds/milliseconds), countdown timer with quick presets. Shows your local current time and timestamp on load, runs entirely in-browser with no internet required.

Free online URL encode/decode tool supporting encodeURIComponent, encodeURI, RFC 3986 modes. Real-time encoding highlight, batch mode, Query Only mode. Browser-local processing.

GeekFormat free online JSON Diff tool. Compare two JSON objects side by side with highlighted added, deleted, and modified fields. Auto-formats before performing line-by-line and character-by-character comparison, with real-time stats for additions, deletions, and modifications. Supports both text and semantic views. Ideal for API integration debugging, config file version comparison, and automated test assertions.

Free online image resizer for exact pixel dimensions with proportional scaling and drag preview. Runs locally for privacy; resize and download instantly.

Free PDF splitter with 4 modes: free pick, by range, per page, equal split. Results auto-zipped. pdf-lib, runs in browser, no watermark, no upload.

Free online SSL/TLS certificate checker tool. Check certificate validity, domain matching, days remaining, TLS protocol versions, cipher suites, ALPN, SAN list, and certificate fingerprints. Backend-initiated TLS handshake with no CORS restrictions. Ideal for deployment validation, expiration alerts, and troubleshooting.

Free online MD5 hash calculator supporting text, file, batch line-by-line, and HMAC-MD5 modes. UTF-8/Latin1 encoding, uppercase output, 8-char grouping, chunked file hashing for large files. ⚠️ MD5 is NOT secure for passwords.

Free online Unix timestamp converter supporting bidirectional conversion between seconds, milliseconds, and microseconds with automatic unit detection. Switch between UTC and local timezone, view live current timestamp, and get code examples for JavaScript, Python, Go, and Bash. Perfect for development debugging, log analysis, and API integration.

Free online image cropper. Drag-and-drop, 8 ratios, pixel controls, rule of thirds grid, PNG/JPG export. 100% browser-based, no upload needed.

Free JSON Escape / Unescape online tool by GeekFormat, built for developers. Escape and unescape JSON strings with one click, solving code embedding issues with quotes, newlines, and backslashes. Supports real-time syntax validation, smart repair, and multi-language code compatibility. Perfect for frontend development, API debugging, JSON-LD generation, and log data processing. Local processing, fast and secure.

Free online AES encrypt/decrypt tool supporting AES-CBC, AES-GCM, and AES-CTR modes with AES-128/192/256 key sizes. Includes PBKDF2-SHA256 key derivation with 100,000 iterations, real-time password strength checks, and fully client-side browser processing with no upload.

Free secure password generator using browser Web Crypto CSPRNG. Generate strong random passwords, memorable passphrases, and numeric PINs. Strength meter, batch export, local-only generation.

Free online WHOIS/RDAP domain and IP lookup tool. Enter a domain or IP to view registrar, registrant, creation date, expiration date, domain status, and more. Features smart field extraction, color-coded expiration alerts, and one-click copy. Ideal for domain renewal, asset inventory, and security analysis.

Free online DNS lookup tool supporting 7 record types: A/AAAA/CNAME/MX/TXT/NS/SOA. Backend DNS queries without CORS restrictions, displays TTL, MX priority, recent lookup history, one-click copy, raw JSON. Ideal for domain resolution troubleshooting, email configuration verification, and CDN switch checks.

Free online Hexadecimal Converter. Instantly convert between Hex, Decimal, Binary, Octal and 2–36 base number systems. Supports fractional numbers, high-precision calculation, no registration required.

Free SHA-256 hash generator for text, files & batches. 5 algorithms at once, Hex/Base64, drag-drop, 100% client-side. No upload.

Free online HMAC signature generator and verifier supporting HMAC-SHA256/384/512/SHA1/MD5. Perfect for Stripe/GitHub/Shopify/Slack webhook signature verification. Hex/Base64/Base64URL output formats. 100% browser-based, keys never leave your device.

Free online UUID generator supporting UUID v1/v4/v5, ULID, and NanoID in one tool. Bulk generate up to 100 IDs, toggle case/hyphen formatting, validate UUID version recognition. Ideal for database primary keys, distributed IDs, API request identifiers, and test data generation. Copy all or export to TXT/JSON. All generation runs locally in your browser—no data uploaded.

Free online .htaccess to Nginx converter. Convert Apache RewriteRule, redirects, and URL rewriting rules to Nginx Rewrite configuration. Perfect for website migration, server switching, and operations troubleshooting.

Free online file hash checker. Compute MD5, SHA-1, SHA-256, SHA-512 in your browser. Toggle case and auto-compare an expected value for downloads.

Online Base64 DataURL tool to convert between plain Base64 and data URLs. Auto-detects MIME type, strips whitespace, runs locally in your browser.

Online SHA1 hash calculator that instantly generates 40-character hexadecimal digests from text. Supports text and file hashing with local browser processing for privacy, compatible with Git, SVN, and Linux workflows.

Free SHA-512 hash calculator: text, file, batch, HMAC modes. Local browser compute via Web Crypto API. SHA-384 and SHA-512/256 variants supported.