Every tool on YoussefLabs runs directly inside your web browser. Your sensitive code, documents, images, and data are never uploaded to remote servers.
Prettify, format, validate, and minify JSON data with instant local parsing and syntax error diagnostics.
Encode text to Base64 or decode Base64 back to text in your browser. Unicode-safe, so Arabic, Greek, and emoji work.
Count words, characters, lines, paragraphs, and reading time as you type. Works with English, Arabic, Greek, and more, right in your browser.
Combine multiple PDF files into one document. Reorder the files, then merge and download, all in your browser.
Compress JPEG, PNG, and WebP images in your browser. Adjust quality, resize, convert formats, and download the result without uploading anything.
Change the width and height of a JPEG, PNG, or WebP image in your browser. Keep the aspect ratio or set exact pixels, then download the result.
Prettify, format, validate, and minify JSON data with instant local parsing and syntax error diagnostics.
Encode text to Base64 or decode Base64 back to text in your browser. Unicode-safe, so Arabic, Greek, and emoji work.
Percent-encode or decode a URL component in your browser, using JavaScript's encodeURIComponent rules.
Generate random version 4 UUIDs in your browser, one or up to 100 at a time, and copy them all with one click.
Generate SHA-256, SHA-384, or SHA-512 hashes of text in your browser using the Web Crypto API.
Count words, characters, lines, paragraphs, and reading time as you type. Works with English, Arabic, Greek, and more, right in your browser.
Count characters, letters, digits, spaces, and lines as you type. Emoji count as one character, all in your browser.
Convert text to UPPERCASE, lowercase, Title Case, Sentence case, and more, plus camelCase, snake_case, and kebab-case, in your browser.
Remove repeated lines from a list while keeping the first occurrence of each, with case and whitespace options, in your browser.
Sort text line by line, A to Z or Z to A, or by the number at the start of each line, in your browser.
Reverse text by characters, words, or lines in your browser, without breaking emoji or accented letters.
Convert a JSON array of objects to CSV, or CSV back to JSON, in your browser. Quoted fields, commas, and line breaks are handled correctly.
Convert Unix timestamps in seconds or milliseconds to UTC and local dates, and dates back to timestamps, in your browser.
Convert colors between HEX, RGB, and HSL with a live swatch, right in your browser. Type any one format to see the other two.
Convert integers between binary, octal, decimal, and hexadecimal in your browser, exactly, even for numbers beyond 2^53.
Convert temperatures between Celsius, Fahrenheit, and Kelvin in your browser, with absolute zero enforced.
Convert bytes, KB, MB, GB, TB and KiB, MiB, GiB, TiB in your browser, keeping decimal and binary units clearly apart.
Combine multiple PDF files into one document. Reorder the files, then merge and download, all in your browser.
Extract pages from a PDF into a new file. Pick pages and ranges like 1-3, 5, 8, in any order, and download the result, all in your browser.
Delete pages from a PDF. List the pages or ranges to remove, like 2, 4-5, and download the smaller PDF, all in your browser.
Put the pages of a PDF in any order. Type the exact page order, like 5, 1, 3-4, 2, and download the result, all in your browser.
Rotate all or selected pages of a PDF by 90°, 180° or 90° counter-clockwise, and download the result, all in your browser.
Compress JPEG, PNG, and WebP images in your browser. Adjust quality, resize, convert formats, and download the result without uploading anything.
Change the width and height of a JPEG, PNG, or WebP image in your browser. Keep the aspect ratio or set exact pixels, then download the result.
Convert images between JPEG, PNG, and WebP in your browser. Choose the output format and download the converted file without uploading anything.
Generate strong random passwords with your browser's secure random number generator. Choose length and character types, with nothing stored or sent.
Generate random integers between a minimum and a maximum, with optional unique numbers, using secure browser randomness.
Find a percentage of a number, what percent one number is of another, or the percentage change between two values, in your browser.
Calculate age in years, months, and days from a date of birth to today or any date, using real calendar arithmetic.
Find the number of days, weeks, months, and years between two dates in your browser, in either order.
Generate lorem ipsum placeholder text as paragraphs, sentences, or words, built in your browser from a local word list.
Why engineers and privacy-conscious users prefer YoussefLabs
Your inputs, confidential tokens, and files are transformed in-memory in your browser tab. Nothing is stored or transmitted.
Without round-trip network delays, your files and formats process at native CPU speeds with zero server latency.
No signups, no paywalls, no marketing trackers inspecting your content. A straightforward utility hub you can bookmark and rely on.