Get in touch with DevTol team for feature suggestions, tool contributions, or technical bug reports.
We welcome developer contributions, feature suggestions, and technical feedback:
100% Free Client-Side PDF Editor. Edit PDF text directly, find & replace text with full Arabic support, load system fonts, add signatures, draw, and redact PDFs securely in your browser.
Merge multiple PDF files into one. 100% client-side - files never leave your browser.
Split or extract specific pages from a PDF file. Client-side processing, total privacy.
Reduce PDF file size with adjustable quality. 100% browser-based, no uploads.
Convert PDF pages to PNG or JPG images. Download all pages as a ZIP. Client-side only.
Convert JPG, PNG, or WebP images into a single PDF document. No server uploads.
Password-protect or unlock PDF files directly in your browser. Zero server uploads.
Reorder and rotate PDF pages visually. Drag and rearrange pages then download.
Extract text from scanned PDFs and images using OCR. Supports multiple languages.
Permanently redact sensitive text from PDF files. Client-side privacy guaranteed.
Add text watermarks to all pages of a PDF. Custom position, opacity, and font.
Estimate prompt tokens via BPE heuristic and compare live pricing across OpenAI, Anthropic, Gemini, and DeepSeek with prompt caching discounts.
Generate regular expressions from natural language prompts, disassemble pattern structures, test live strings with capture groups, and export production code.
Convert raw SQL CREATE TABLE DDL statements into Prisma schemas, SQLAlchemy 2.0 models, Drizzle ORM, TypeORM, Go GORM, and TypeScript interfaces.
Compress JPG, PNG, and WebP images up to 90% smaller. Real-time preview, no uploads.
Convert WebP to PNG/JPG or convert PNG/JPG to WebP format. Client-side processing.
Resize images to exact dimensions or crop to standard aspect ratios. No server uploads.
Convert SVG vector files to PNG, JPG at any scale. Upload file or paste SVG code.
View and strip EXIF metadata from photos. See camera settings, GPS location and more.
Convert video clips to animated GIF. Set start/end time, size and FPS. Client-side.
Generate color palettes, convert between HEX/RGB/HSL/CMYK and check WCAG contrast ratios.
Generate all favicon sizes (16x16 to 512x512) and app icons from a single image. Download as ZIP.
Add text or image watermarks to photos with custom position, opacity and style.
Scan QR codes from images or your camera. Detects URLs, WiFi, vCards and plain text.
Count words, characters, sentences, paragraphs and estimate reading time in real-time.
Find and replace text using regular expressions with live preview and match highlighting.
Sort lines, remove duplicates, trim whitespace and clean text. Multiple sort options.
Validate, format, and convert YAML to JSON. Get detailed syntax error messages.
Encrypt and decrypt text with AES-GCM using a password. Runs 100% in your browser.
Build, sign and decode JSON Web Tokens with custom header, payload and HMAC-SHA256 secret.
Extract text from images using OCR. Supports English, Arabic, French, German and more.
Generate realistic dummy data: names, emails, addresses, UUIDs, dates. Export as JSON or CSV.
Remove duplicate lines, sort, trim whitespace and clean text lists instantly.
Convert text to audio with browser-native speech synthesis. Adjust voice, speed, and pitch.
Generate random string with the chars you want, uppercase or lowercase letters, numbers and/or symbols.
Hash a text string using the function you need : MD5, SHA1, SHA256, SHA224, SHA512, SHA384, SHA3 or RIPEMD160
Hash and compare text string using bcrypt. Bcrypt is a password-hashing function based on the Blowfish cipher.
A Universally Unique Identifier (UUID) is a 128-bit number used to identify information in computer systems. The number of possible UUIDs is 16^32, which is 2^128 or about 3.4x10^38 (which is a lot!).
Generate random Universally Unique Lexicographically Sortable Identifier (ULID).
Encrypt clear text and decrypt ciphertext using crypto algorithms like AES, TripleDES, Rabbit or RC4.
Generate a BIP39 passphrase from an existing or random mnemonic, or get the mnemonic from the passphrase.
Computes a hash-based message authentication code (HMAC) using a secret key and your favorite hashing function.
Generate a new random RSA private and public pem certificate key pair.
Discover the strength of your password with this client-side-only password strength analyser and crack time estimation tool.
Verify the signatures of a PDF file. A signed PDF file contains one or more signatures that may be used to determine whether the contents of the file have been altered since the file was signed.
Convert date and time into the various different formats
Convert a number between different bases (decimal, hexadecimal, binary, octal, base64, ...)
Convert Roman numerals to numbers and convert numbers to Roman numerals.
Simply encode and decode strings into their base64 representation.
Convert a string, file, or image into its base64 representation.
Convert color between the different formats (hex, rgb, hsl and css name)
Transform the case of a string and choose between different formats
Transform text into the NATO phonetic alphabet for oral transmission.
Convert text to its ASCII binary representation and vice-versa.
Parse and convert text to unicode and vice-versa
Simply convert YAML to JSON with this online live converter.
Parse and convert YAML to TOML.
Simply convert JSON to YAML with this online live converter.
Parse and convert JSON to TOML.
This tool can process column-based data and apply various changes (transpose, add prefix and suffix, reverse list, sort list, lowercase values, truncate values) to each row.
Parse and convert TOML to JSON.
Parse and convert TOML to YAML.
Convert XML to JSON
Convert JSON to XML
Convert Markdown to Html and allow to print (as PDF)
Encode text to URL-encoded format (also known as "percent-encoded"), or decode from it.
Escape or unescape HTML entities (replace characters like <,>, &, " and \' with their HTML version)
Parse a URL into its separate constituent parts (protocol, origin, params, port, username-password, ...)
Get information about your current device (screen size, pixel-ratio, user agent, ...)
Generate a base64 basic auth header from a username and password.
Generate open-graph and socials HTML meta tags for your website.
Generate and validate time-based OTP (one time password) for multi-factor authentication.
Convert MIME types to file extensions and vice-versa.
Parse and decode your JSON Web Token (jwt) and display its content.
Find the javascript keycode, code, location and modifiers of any pressed key.
Make a string url, filename and id safe.
Online, feature-rich WYSIWYG HTML editor which generates the source code of the content immediately.
Detect and parse Browser, Engine, OS, CPU, and Device type/model from an user-agent string.
The list of all HTTP status codes, their name, and their meaning.
Compare two JSON objects and get the differences between them.
Decode Outlook SafeLink links
Generate and download a QR code for a URL (or just plain text), and customize the background and foreground colors.
Generate and download QR codes for quick connections to WiFi networks.
Generate svg images to use as a placeholder in your applications.
Take a picture or record a video from your webcam or camera.
Git is a decentralized version management software. With this cheatsheet, you will have quick access to the most common git commands.
Generate random port numbers outside of the range of "known" ports (0-1023).
Validate and generate crontab and get the human-readable description of the cron schedule.
Prettify your JSON string into a friendly, human-readable format.
Minify and compress your JSON by removing unnecessary whitespace.
Convert JSON to CSV with automatic header detection.
Format and prettify your SQL queries online (it supports various SQL dialects).
Compute your chmod permissions and commands with this online chmod calculator.
Transforms "docker run" commands into docker-compose files!
Prettify your XML string into a friendly, human-readable format.
Prettify your YAML string into a friendly, human-readable format.
Normalize email addresses to a standard format for easier comparison. Useful for deduplication and data cleaning.
Test your regular expressions with sample text.
Javascript Regex/Regular Expression cheatsheet
Convert cURL commands into clean, production-ready code in Python, JavaScript, TypeScript, Go, PHP, Rust, and Java with 100% client-side privacy.
Parse your IPv4 CIDR blocks and get all the info you need about your subnet.
Convert an IP address into decimal, binary, hexadecimal, or even an IPv6 representation of it.
Given a start and an end IPv4 address, this tool calculates a valid IPv4 subnet along with its CIDR notation.
Find the vendor and manufacturer of a device by its MAC address.
Enter the quantity and prefix. MAC addresses will be generated in your chosen case (uppercase or lowercase)
Generate your own local, non-routable IP addresses for your network according to RFC4193.
A calculator for evaluating mathematical expressions. You can use functions like sqrt, cos, sin, abs, etc.
An ETA (Estimated Time of Arrival) calculator to determine the approximate end time of a task, for example, the end time and duration of a file download.
Easily calculate percentages from a value to another value, or from a percentage to a value.
Monitor the duration of a thing. Basically a chronometer with simple chronometer features.
Degrees temperature conversions for Kelvin, Celsius, Fahrenheit, Rankine, Delisle, Newton, Réaumur, and Rømer.
Easily compare execution time of tasks with this very simple online benchmark builder.
Lorem ipsum is a placeholder text commonly used to demonstrate the visual form of a document or a typeface without relying on meaningful content
Get information about a text, the number of characters, the number of words, its size in bytes, ...
Copy and paste emojis easily and get the unicode and code points value of each emoji.
Obfuscate a string (like a secret, an IBAN, or a token) to make it shareable and identifiable without revealing its content.
Compare two texts and see the differences between them.
A numeronym is a word where a number is used to form an abbreviation. For example, "i18n" is a numeronym of "internationalization" where 18 stands for the number of letters between the first i and the last n in the word.
Create ASCII art text with many fonts and styles.
Parse, validate and format phone numbers. Get information about the phone number, like the country code, type, etc.
Validate and parse IBAN numbers. Check if an IBAN is valid and get the country, BBAN, if it is a QR-IBAN and the IBAN friendly format.
Calculate your monthly mortgage payment including principal, interest, taxes, and insurance (PITI) with complete amortization schedule.
Calculate compound interest on your investments or savings with regular deposits and detailed yearly breakdown.
Estimate your Google AdSense daily, monthly, and yearly revenue based on pageviews, CTR%, CPC, or RPM across various industry niches.
DevTol is engineered as a secure, high-craft productivity workspace for software engineers, DevOps architects, sysadmins, and UI/UX designers. The core design principle governing all tools is Strictly Client-Side Execution (Zero-Server Architecture).
Conventional developer utilities upload your proprietary source code, private JWT tokens, database dumps, and API keys to third-party cloud servers for processing. DevTol eliminates this attack surface entirely through modern web browser primitives:
| Engineering Metric | DevTol Client-Side Suite | Traditional Cloud Converters |
|---|---|---|
| Data Transmission | Zero (0 bytes transmitted) | Full payload uploaded over HTTP |
| Server Logging & Telemetry | Technically impossible (no backend) | Inputs recorded in access logs and CDNs |
| Regulatory Compliance (GDPR/SOC2) | 100% compliant by mathematical design | Requires Data Processing Agreements (DPA) |
| Execution Latency | Near-instantaneous local CPU speed | Network round-trip latency + queue time |
All algorithms implemented in DevTol strictly adhere to formal Internet Engineering Task Force (IETF) and W3C specifications:
A: Absolutely not. Every single operation runs 100% locally in your browser sandbox using JavaScript and WebAssembly. You can open your browser's Developer Tools Network Tab and verify that zero requests containing your data are ever made.
A: Yes, all tools are 100% free and open-source. Because compute execution happens on your local device CPU, there are no expensive backend compute clusters, allowing us to keep the platform free without registration barriers.
A: DevTol is built as a Progressive Web App (PWA). Once loaded, our Service Worker caches all scripts and styles locally on your machine, enabling seamless offline usage anytime.