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ToolForUser
  • Image CompressorImage Tools · Make photos and graphics smaller by re-encoding them as JPG or WebP, with a quality slider and optional downscaling.
  • Image ResizerImage Tools · Change the width and height of an image in pixels or by percentage, with high-quality downscaling.
  • Image ConverterImage Tools · Change the format of one or many images to JPG, PNG or WebP, with control over quality and transparency.
  • Image CropperImage Tools · Cut out part of an image with a draggable selection, aspect ratio presets and exact pixel inputs.
  • Rotate & Flip ImageImage Tools · Turn a picture by 90° or 180° and mirror it horizontally or vertically, with a live preview.
  • Merge PDFPDF Tools · Combine several PDF files into one document, in the order you choose, with optional page ranges per file.
  • Split PDFPDF Tools · Extract pages into a new PDF or split a document into several files by page, range or fixed page count.
  • Reorder PDF PagesPDF Tools · Change the page order of a PDF with drag and drop, delete unwanted pages and save the result.
  • Rotate PDFPDF Tools · Turn individual pages or the whole document by 90° steps, preview the result and save the corrected PDF.
  • Images to PDFPDF Tools · Combine photos and scans into a single PDF, one image per page, with page size, orientation and margin options.
  • JSON Formatter & ValidatorDeveloper Tools · Validate JSON with precise error locations, then pretty-print, minify or sort keys without changing any value.
  • Base64 Encoder & DecoderDeveloper Tools · Encode text or files to Base64 (standard or URL-safe) and decode Base64 or data: URLs back to text or a downloadable file.

About ToolForUser

ToolForUser is a collection of 20 free online tools for working with images, PDF files, data formats and everyday calculations.

How the tools work

Most online converters upload your file to a server, process it there and send the result back. ToolForUser works differently: the tools are small programs that run inside your web browser. When you choose a file, the browser reads it from your device, the tool processes it in memory, and the result is saved straight back to your device.

That has three practical benefits: your documents are not sent to anyone, there is no waiting for uploads, and once a tool has finished loading, processing does not depend on your internet connection. The only network traffic is the download of the website itself (HTML, CSS, JavaScript and the code libraries the tools need) and, if advertising is enabled on the site, the requests made by the advertising provider. Details are in the privacy policy.

What you can do here

  • Image Tools – Compress, resize, convert, crop, rotate and flip JPG, PNG and WebP images directly in your browser. No uploads, no sign-up, free.
  • PDF Tools – Merge, split, reorder and rotate PDF pages or turn images into a PDF in your browser. Files stay on your device. Free, no sign-up.
  • Developer Tools – Format and validate JSON, encode and decode Base64 and URLs, calculate SHA-256 hashes and test regular expressions. Runs locally in your browser.
  • Calculators & Everyday Tools – Count words and characters, calculate the days between dates, work out percentages, convert units and create QR codes. Free and private.

Principles

  • Local processing first. A tool is only added if it can do its job in the browser without sending your data to a server.
  • No accounts. There is nothing to sign up for and no usage limits beyond what your device can handle.
  • Honest descriptions. Each tool page explains what the tool does, how to use it and what it cannot do.
  • Accessible and lightweight. Pages work with a keyboard, adapt to phones and tablets, support dark mode and only load the code a tool needs when you open it.

Open-source components

The tools rely on browser features (Canvas, Web Crypto, Web Workers) and these open-source libraries:

  • pdf-lib (MIT) – reading and writing PDF files
  • PDF.js (Apache-2.0) – rendering PDF page previews
  • fflate (MIT) – creating ZIP archives
  • qrcode-generator (MIT) – QR code encoding
  • React (MIT) – user interface

These libraries are served from this website, not from third-party CDNs.

Costs and advertising

The tools are free. To cover hosting and development costs, the site may show advertising. Ads are kept separate from the tools: they are never placed inside a tool panel, and they cannot see the files or text you process.

Feedback

Found a bug or have an idea for a new tool? Please get in touch via the contact page.