所有在线工具

Add Page Numbers inserts clean, automatic page numbering into any PDF so your documents look polished and are easy to reference. Choose where the numbers appear — bottom center, the corners, or the top — and the tool stamps neat, sequential numbers onto every page for you. Proper pagination is essential for reports, ebooks, theses, legal filings, manuals, and manuscripts, where readers and reviewers need to point to a specific page. You no longer have to renumber by hand or reprint a document just to add page numbers. The tool processes your file locally in your browser, so it stays completely private, and the finished PDF downloads instantly. It is free to use, leaves no watermarks, and needs no account.

Create pixel art.

Caesar Cipher encrypts and decrypts text using the classic shift cipher, where each letter is moved a set number of places in the alphabet. Choose any shift from 1 to 25 to encode secret messages or decode them. It is a fun, educational tool for learning cryptography basics and solving puzzles. Everything runs in your browser, so your messages stay private.

Translate Gregorian dates into official Japanese Imperial Era dates.

Text Translator converts text between over 100 languages so you can understand and communicate across borders. Translate messages, articles, and phrases instantly. It is fast, free, and great for quick translations on the go.

The Days Calculator instantly counts how many days are between two dates, and shows the result in weeks, weekdays (business days), weekend days, and hours. Switch to the Add / Subtract mode to find the date a set number of days before or after any start date — perfect for deadlines, due dates, contracts, countdowns, and project planning. It is free, instant, and runs privately in your browser.

Find & Replace searches your text for a word or phrase and swaps it for another, all at once. Clean up documents, fix repeated typos, or reformat data quickly. It supports case-sensitive matching and runs entirely in your browser.

JSON Formatter beautifies messy JSON with proper indentation and validates it so you can spot errors instantly. Paste minified JSON to make it readable, or check that an API response is well-formed. It runs entirely in your browser.

Convert between different units.

Watermark Image lets you stamp your photos with a custom text watermark to protect your work and build your brand. Add watermarks to many images at once, adjust the text, color, position, size, and opacity with a live preview, then download every watermarked image together in a ZIP. Everything runs in your browser, so your photos are never uploaded.

Calculate aspect ratios.

Base64 Encoder converts text to Base64 and decodes Base64 back to plain text. Useful for embedding data, debugging APIs, and handling encoded strings. Encoding and decoding happen instantly in your browser with no data sent anywhere.

Format SQL queries.

Crop Image lets you trim away unwanted edges and frame your photo exactly how you want. Crop freely or use preset aspect ratios for square posts, banners, and profile pictures. It works in your browser for fast, private edits with no quality loss.

Generate bcrypt hashes.

Verify HMRC format rules for UK NI Numbers.

Encode HTML entities.

Easily calculate Philippine land title measurements.

Convert Japanese real estate sizes to Sq Meters.

Compound Interest Calculator shows how an investment or savings balance grows over time with compounding, including optional regular monthly deposits. Enter your principal, interest rate, time period, and compounding frequency to see your final balance, total contributions, and interest earned. It is perfect for planning savings, investments, and retirement goals. It runs instantly in your browser.

Calculate your mandatory monthly statutory deductions.

减小视频文件大小。

Calculate your Salário Líquido in Brazil.

Extract Audio pulls the sound out of a video and saves it as an MP3 or WAV file. Perfect for grabbing music, podcasts, lectures, or interview audio from a clip. Extraction runs in your browser, so your video never leaves your device.