CapyToolkit

What is CapyToolkit?

CapyToolkit is a suite of free browser utilities for hardware testing, development, audio and file work. Its tools process data locally through browser APIs.

What CapyToolkit does

The live tools include PDF conversion and editing, image size reduction, JSON formatting, regular-expression testing and contrast checks. Other categories cover hardware diagnostics, audio testing, engineering calculations and network references. The installed app caches tools locally for offline use, while accounts and file uploads are not required.

Who CapyToolkit is for

People testing devices, inspecting development data or preparing local files can use CapyToolkit. The suite also provides document and photo utilities for everyday tasks and calculators for engineering work.

How CapyToolkit works

The user opens a relevant utility and supplies its local input, such as a file, text or device test. Tools can be bookmarked or installed as a cached app for use offline. The companion guides explain the same hardware, developer and security topics.

Key features

• JSON tools format, validate and display trees.
• Regex tools highlight matches and capture groups.
• Contrast checking supports hex, RGB and HSL.
• Local PDF tools merge, split, reorder and rotate files.
• PDF conversion can use local AI for scanned pages.
• Image reduction targets a file-size limit.
• Document deskew creates multi-page PDF output.
• Receipt splitting assigns tax and tip locally.

Facts from capytoolkit.com, checked 13 October 2026

• The site provides an installation option through Microsoft Store.

Written from CapyToolkit's own website (Homepage, About). The maker can claim this listing to edit it.