ToolBox at a Glance
- free tools
- 191
- categories
- 14
- files uploaded to a server
- 0
- cost, with no paid tier
- $0
How ToolBox Works
Pick a tool
Browse 14 categories or search by name. All 191 tools open directly, with no sign-up screen and no paywall in front of any of them.
Drop in your file or text
Your input is read by the page itself through the browser File and Canvas APIs. Nothing is sent over the network, which is why the tools also keep working after the page has loaded.
Download the result
The output is generated locally and saved straight to your device. No watermark is added, and nothing about the file is retained after you close the tab.
ToolBox vs a Typical Converter Site
| Criterion | ToolBox | Typical freemium converter site |
|---|---|---|
| Account required | No | Usually, after a few uses |
| Where files are processed | In your browser | Uploaded to the provider’s server |
| File size limit | Limited only by your device memory | Commonly capped on the free tier |
| Watermarks on output | None | Common on free exports |
| Works offline after load | Yes, for most tools | No, the server does the work |
| Price | Free, no paid tier | Freemium with a paid upgrade |
Key Terms Explained
- Client-side processing
- Work performed by JavaScript inside your own browser instead of on a remote server. It is what lets ToolBox handle a file without ever transmitting it.
- Lossy vs lossless compression
- Lossy compression (JPEG, WebP at low quality) discards image detail to shrink the file. Lossless compression (PNG, WebP at quality 100) keeps every pixel and produces larger files.
- Base64 encoding
- A way of representing binary data using 64 printable ASCII characters, defined in RFC 4648. It makes binary safe to embed in text formats such as JSON, HTML, or email.
- Contrast ratio
- The measured difference in luminance between text and its background, from 1:1 to 21:1. WCAG 2.2 asks for at least 4.5:1 for normal body text.
Tool Categories
All 191 tools are grouped into the categories below.
Frequently Asked Questions
Are ToolBox tools really free?
Yes. All 191 tools are free with no paid tier, no trial period, and no usage credits. The site is funded by advertising, not by charging for the tools.
Do I need an account to use ToolBox?
No. There is no sign-up, no login, and no email required. Every tool opens and runs immediately when you visit its page.
Are my files uploaded to a server?
No. Files are read and processed by JavaScript running in your own browser through the File and Canvas APIs. The file data never leaves your device, so we never receive it and cannot store it.
Is there a file size limit?
ToolBox imposes no limit. The practical ceiling is your device memory, since the whole file is held in the browser tab. On a typical laptop, images and PDFs of several hundred megabytes work fine.
Does ToolBox work on a phone or tablet?
Yes. Every tool is responsive and works in mobile Chrome, Safari, Firefox, and Edge. ToolBox is also installable as a PWA, so it can be added to your home screen.
Can I use the output for commercial work?
Yes. You keep full rights to anything you process or generate. ToolBox adds no watermark and claims no ownership over your files or output.
How many tools does ToolBox have?
ToolBox currently offers 191 tools across 14 categories: image, developer, text, encoding, math, color, generators, time, PDF, CSS, health, SEO, network, and video & audio.
Sources and References
ToolBox implements the following published standards and reference data.
- RFC 4648: The Base16, Base32, and Base64 Data Encodings: Base64 encoder and decoder
- RFC 9562: Universally Unique IDentifiers (UUIDs): UUID generator
- WCAG 2.2: Contrast (Minimum): Color contrast checker
- MDN: Canvas API: Image resizer, compressor, and converter
- World Health Organization: Obesity and overweight: BMI formula and calculator thresholds