Popular Tools

Free online PDF compressor by GeekFormat. Reduce PDF file size instantly while maintaining maximum quality. Choose from multiple compression levels to bypass email & upload limits. Safe, secure, and no registration required!

Compress images online for free and reduce JPG, PNG, and WEBP file size without obvious quality loss. Ideal for upload limits, email attachments, lighter web pages, and faster content publishing.

Free JSON Formatter online tool by GeekFormat, built for full-stack developers. Format, compress, validate, and auto-fix JSON syntax errors in one click. Features a powerful visual tree editor with node CRUD and array drag-and-drop sorting. Generate TypeScript, Java, Python, Go entity class code from JSON. Perfect for API debugging, data structure conversion, and complex JSON editing. Ultra-fast local processing, fully secure.

Free online JWT tool for decoding, verifying and generating JWT tokens. View Header, Payload, expiration and signature details. Perfect for API authentication debugging, token troubleshooting and integration testing.

Free online QR code generator. Create URL QR codes, WiFi QR codes, vCard QR codes, text QR codes, and barcodes. Perfect for store posters, event registration, product labels, and sharing.

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.

GeekFormat's free online Base64 encoder. Instantly convert text, strings, and Unicode characters to Base64 format. Supports URL-safe encoding and MIME line wrapping. Perfect for generating API parameters, HTTP Basic Auth headers, JWT payloads, and development testing.

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.

Edit PDFs online for free from your phone or computer. Add text, images, highlights, and signatures in seconds. Everything runs in your browser, no uploads.

Convert image formats online for free, including JPG, PNG, WEBP, and HEIC. Useful when photos will not open, upload systems reject a format, or iPhone images need broader compatibility.

Free JSON Diff online tool by GeekFormat, designed for developers and testers. Compare two JSON objects side by side with highlighted added, deleted, and modified fields. Supports ignoring array order, whitespace, and path navigation. Perfect for API integration testing, config file version comparison, and automated test assertions.

Free online public IP checker. Automatically detect IPv4, IPv6, and exit network information. Perfect for whitelist configuration, proxy troubleshooting, remote connections, and API authorization.

Free online image editor for adding text, arrows, shapes, blur, crop, and quick annotations. Great for screenshot markup, privacy redaction, everyday photo touch-ups, and watermark-free export in your browser.

Convert images to PDF online for free. Supports JPG, PNG, GIF, WEBP. Adjust page size, orientation, and margins. Everything runs in your browser, no uploads.

Validate JSON against JSON Schema online for free. Built for full-stack developers and QA engineers. Based on JSON Schema Draft-07, instantly check data consistency with schema definitions. Supports type checking, required fields, regex matching, enum values, format validation, and allOf/anyOf/oneOf combination logic. Provides precise error path location and detailed error messages. Perfect for API contract testing, frontend-backend data structure debugging, automated data cleaning and governance. Pure local processing, fast and secure. Try now.

Free online MD5 hash calculator for text and files. Perfect for integrity verification, quick comparison and download file validation. Instant calculation with one-click copy.

Free online Regex Tester. Support Regex matching test, group viewing, and replace preview. Perfect for form validation, text extraction, log analysis, and development debugging.

Free online WHOIS and RDAP information lookup. Quickly view domain or IP registrar, creation date, expiration date, and status. Perfect for domain management, asset inventory, and expiration risk troubleshooting.

GeekFormat's free online AES encryption tool. Encrypt and decrypt data securely with AES-CBC, GCM, CTR, and ECB modes. Supports 128/192/256-bit keys, custom IV, and PKCS7/ZeroPadding. Perfect for API debugging, ciphertext verification, and local symmetric encryption testing — no data upload.

Crop images online for free with freeform selection, fixed aspect ratios, and precise area trimming. Useful for avatars, product photos, thumbnails, document photos, and social media visuals.

Free online Cookie request header parser. View name, value, decoded result, and duplicates item by item. Perfect for troubleshooting login issues, session problems, and API reproduction scenarios.

Merge multiple JSON objects online for free. Supports deep merge, shallow merge, and flexible array strategies. Perfect for config management, microservice aggregation, and API data stitching. Start now.

Convert PDF to Word for free with high accuracy. Preserves fonts, tables, and original layout. All in your browser, no install needed. Download your result now.

Free online unit converter for length, weight, temperature, area, volume, speed, and more. Perfect for schoolwork, engineering estimates, office tasks, and everyday conversions. Enter a value and get instant results.

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.

GeekFormat's free online Audio to Base64 converter. Instantly encode MP3, WAV, OGG, and M4A files into Base64 strings or Data URI Schemes. Perfect for embedding audio in HTML5/JS, API payload testing, and JSON data transmission. 100% client-side processing ensures your audio files never leave your device.

Free online Authorization request header generator. Configure Basic, Bearer, ApiKey on one page, and reverse-lookup Basic credential content. Perfect for API integration, packet capture reproduction, and 401/403 troubleshooting. Copy directly after generation.

Free CSV to JSON online tool by GeekFormat. Convert CSV table data to standard JSON arrays with one click. Supports automatic parsing, error detection, structure repair and JSON-LD formatting. Perfect for API data preparation, frontend debugging, SEO structured data and batch data cleaning. File upload/download, real-time preview.

Add a PDF watermark online for free. Insert text or logo watermarks, adjust opacity, angle, spacing, and layout, then export in seconds. Ideal for confidential files, branding, and copyright protection. Try it now.

Add page numbers to any PDF online for free. Customize position, font, size, and format. Perfect for theses, reports, and manuals. Everything runs in your browser.

Free online Cache-Control parser and generator. Understand max-age, s-maxage, public, private, and stale-while-revalidate at a glance. Perfect for frontend caching, CDN configuration, and performance troubleshooting.

Convert between camelCase, snake_case, kebab-case and more naming styles

The fastest online JSON compressor and minifier. Instantly strip whitespaces, newlines, and indentations to generate single-line compact JSON payloads. Supports advanced JSON Escaping (Escape/Unescape) with automated syntax validation and data privacy. Improve API latency and bandwidth savings instantly.

Free online URL encoding and decoding tool supporting encodeURIComponent and encodeURI. Perfect for link parameters, callback URLs, signature strings and API debugging. Copy results instantly.

GeekFormat's free online Base32 encoder and decoder. Fully compliant with RFC 4648 standard. Perfect for encoding TOTP/2FA secrets, DNS labels, and case-insensitive data transmission. Instantly convert text and binary to Base32 strings with zero data upload.

Free online color blind simulator. Preview how colors and images appear under color blindness, color weakness, and red-green color blindness perspectives. Perfect for accessible design, UI color checking, and visual accessibility optimization.

Free online Content-Disposition response header parser and generator. Understand attachment, inline, filename, and filename* at a glance. Perfect for troubleshooting download filename garbling, preview behavior, and attachment policies.

GeekFormat's free online Base58 encoder and decoder. Uses the standard Bitcoin alphabet (removing 0, O, I, l). Perfect for encoding/decoding crypto wallet addresses, IPFS CIDs, and URL-safe strings. Instantly convert text and binary to Base58 with zero data upload.

Free online color converter. Support HEX to RGB, RGB to HEX, HSL, HSV, CMYK, and other common color value conversions. Perfect for webpage color schemes, design color matching, and print color value calculation.

Free online CORS response header generator. Visually configure Allow-Origin, Methods, Headers, Credentials, and Max-Age. Perfect for cross-origin debugging, gateway setup, and preflight request handling. Copy and use instantly.

GeekFormat's free online Base64 Batch Decoder. Decode hundreds of Base64 strings at once with line-by-line processing. Perfect for bulk log recovery, API response debugging, and CSV data cleaning. Features automatic whitespace trimming and error tolerance for invalid lines.

Free online Cookie Parser. Parse Set-Cookie headers and Cookie strings, view cookie attributes, support JSON export and Netscape format. Perfect for web development debugging.

Free online CORS cross-origin configuration checker. Preflight and actual requests analyzed separately, quickly locate Allow-Origin, Credentials, and Headers mismatches and common errors.

GeekFormat's free online Base64 Batch Encoder. Instantly encode multiple lines of text into Base64 strings simultaneously. Perfect for generating bulk API payloads, converting CSV data, and batch processing log entries. Supports standard and URL-safe Base64 with precise newline handling.

Free online Cron expression generator. Visually generate Cron, crontab, and scheduled task expressions with execution time preview. Perfect for Linux operations, backend development, and automation scheduling configuration.

Free online Content Security Policy generator. Visually configure script-src, style-src, img-src, connect-src, frame-ancestors and more. Perfect for website security hardening and pre-launch self-checks.

GeekFormat's free online Base64 Cleaner. Instantly remove spaces, newlines, quotes, BOMs, and other invalid characters from Base64 strings. Perfect for fixing malformed data copied from emails, PDFs, logs, or web pages before decoding. Supports regex-based character filtering.

Free online Cron expression validator. Check Cron and crontab syntax correctness and preview future execution times. Perfect for scheduled task debugging, rule verification, and pre-launch checks.

Free online converter that transforms curl commands into Python, JavaScript, Node.js, Go, PHP, C# and more. Perfect for API integration, debugging reproduction, and documentation examples. Copy and use instantly.

GeekFormat's free online Base64 decoder. Instantly convert Base64 strings back to readable text, binary data, or files. Perfect for debugging API responses, analyzing logs, and recovering configuration values. Supports URL-safe Base64 and automatic padding correction.

Free online CSS formatter. Support CSS code beautification, indentation organization, code layout, and CSS Formatter scenarios. Perfect for development debugging, code review, and collaborative organization.

GeekFormat's free online Base64 Diff Checker. Instantly compare two Base64 strings side-by-side to find character-level differences, truncation issues, and encoding inconsistencies. Features smart whitespace ignoring and precise mismatch highlighting. Perfect for API debugging, data integrity verification, and frontend/backend consistency checks.

Free online CSS formatter. Beautify CSS code, organize indentation and structure. Perfect for development debugging, code review and team collaboration.

Free online CSS minifier. Support CSS code compression, removing extra spaces and line breaks. Perfect for page publishing, static resource optimization, and production environment size control.