Processing on your device
Supported image, video, PDF and text tasks run in your browser, so the original files do not need to be sent to a processing server.
Get everyday file tasks done quickly and safely on your PC.
Resize images and videos, edit PDFs, and organize file names in one place. Your files are processed directly in your browser and stay on your PC.Choose a tool
Select the type of file task you need. Each card takes you to the available options.
01
Image Tools
Resize, convert, compress, crop, rotate and flip JPG, PNG and WebP images locally. Remove GPS and EXIF data without uploading files.
View category →02URL Encoder and Decoder
Encode URL query values and special characters or decode percent-encoded text locally in your browser. No input is uploaded.
View category →03Base64 Encoder and Decoder
Encode UTF-8 text to Base64 or decode Base64 back to readable text locally. Your text never leaves the browser.
View category →04PDF Tools
Merge PDFs, split page ranges, convert PDF pages to images or images to PDF directly in your browser without uploading documents.
View category →05JSON Formatter and Validator
Format, validate, inspect and minify JSON locally in your browser. Paste data or open a JSON file without uploading it.
View category →06QR Code Generator and Reader
Create QR codes for text, Wi-Fi and contacts or read QR codes from images locally without uploading their contents.
View category →07Batch File Renamer
Batch rename files with find and replace, regular expressions, prefixes, suffixes and numbering. Preview changes and download a ZIP locally.
Open tool →08Video Tools
Resize, crop, letterbox, compress, convert and trim videos locally with browser-based FFmpeg. Files are not uploaded.
View category →Why Only My Kit
No unnecessary signup
The core tools can be opened and used without creating an account.
Tools for real-world tasks
Alongside general utilities, Size for me prepares video for Galaxy lock screens, Shorts and Reels.
Size for me →Practical guides
Understand formats, privacy and sizing choices before changing a file.
01 / GUIDE
Size for me guide: Galaxy Lock Screens, Shorts and Reels
Learn how to use Size for me for Galaxy live Lock Screens, YouTube Shorts and Instagram Reels.
About 7 min · Read guide →02 / GUIDEHigh-Performance In-Browser Media Processing with WebAssembly: Architecture & Benchmarks
Discover how WebAssembly and Web Workers enable ultra-fast client-side media compression and transformation without server uploads.
About 6 min · Read guide →03 / GUIDEWebP vs AVIF Comparison: Compression Efficiency and Compatibility Trade-Offs
Analyze the technical architectural differences, Core Web Vitals LCP impact, encoding speeds, and adoption guidelines for WebP and AVIF.
About 6 min · Read guide →04 / GUIDEWhy Your Files Never Leave Your Device: WebAssembly & Browser Sandbox Security
Learn how Only My Kit eliminates server uploads by utilizing WebAssembly and browser sandboxing for 100% private local processing.
About 5 min · Read guide →05 / GUIDEWhat is URL encoding? Why spaces and special characters become % codes
Understand %20 and percent encoding, the difference between URL encode and decode, and how to convert readable links safely.
About 6 min · Read guide →06 / GUIDEWhat is a JSON file? How to open and read JSON from a developer
Learn how to open a JSON file, understand objects, arrays, keys and values, and find data with a JSON Formatter or Tree Viewer.
About 7 min · Read guide →Common tasks
Is a photo too large for an email attachment?
Image Compressor →Need to turn landscape footage into a vertical video?
Video Resizer and Letterbox Tool →Want to combine several documents into one PDF?
PDF Merger →Need consistent names across many files?
Batch File Renamer →What local processing means
Reading, transforming and exporting supported files happens with browser APIs or WebAssembly on your device. This reduces unnecessary upload and download steps.
Processing time depends on file size, codec, browser memory and device performance. Site delivery, analytics and advertising can still use third-party network services as described in the privacy policy.