How to use AltFTool's free browser tools

What every tool page has in common

Every tool lives at its own address, /tools/all/<tool-name>, and follows the same layout so you do not have to relearn anything. At the top is the working area: an input (file drop zone, text box or form), the settings, and the output. Below it is a short guide with use cases, how-to steps, frequently asked questions and related tools.

Tools are grouped into canonical categories such as Image & Video, Text & Writing, Converters and Generators, and the related-tools list at the bottom of each page links to the next tool you are likely to need.

The basic workflow

The steps are the same whether you are converting an image or formatting code.

1. 1

   Open the tool

   Search with Ctrl+K (Cmd+K on Mac) or browse /tools/all, then open the tool page.

2. 2

   Add your input

   Drag a file onto the drop zone, choose it from your device, or paste text. Many file tools accept several files at once.

3. 3

   Adjust the settings

   Pick the output format, quality, size, mode or other options. Most tools update a preview as you change them.

4. 4

   Get the result

   Copy the output to your clipboard or download it. Batch tools usually offer a single ZIP download for all results.

5. 5

   Chain the next step

   Use the related tools section to continue, for example resizing an image after converting it.

Local versus remote processing

A large share of tools never send your data anywhere. The Image Converter decodes and re-encodes images on a canvas in your tab, the Diff Checker compares text locally, and the UUID Generator uses your browser's Web Crypto API. The tool's own FAQ normally answers 'Is my file uploaded?' directly.

Tools that need the internet, such as DNS and WHOIS lookups or anything AI-generated, send only the input required for that request. If you are working with confidential documents, check the tool's privacy answer first and read privacy and local processing.

Limits to expect

Because local tools use your device's memory and processor, very large files are limited by your hardware rather than by an upload cap. Some tools set explicit limits to stay responsive; the PDF Merger, for instance, accepts up to 20 files of up to 80 MB each per batch. Phones can handle most jobs, but big batches are faster on a desktop.

Results are informational. Calculators such as the Percentage Calculator show their formula so you can check the working, but they do not replace professional advice.

Guides for specific jobs

For step-by-step guides see how to compress images online, the PDF tools guide and the developer tools guide. If a tool misbehaves, the troubleshooting guide covers the usual causes.