Frequently Asked Questions
Common questions about JustConvert, how the tools work, privacy, and browser support. Can't find an answer? Contact us.
Is JustConvert free to use?
Yes, JustConvert is completely free. All 94 converter tools are available without any payment, subscription, or account creation.
Do I need to create an account?
No. Every tool on JustConvert works immediately without signing up, logging in, or providing any personal information.
Are my files or data uploaded to a server?
No. All conversions run entirely inside your browser using JavaScript and standard Web APIs (Canvas, TextEncoder, Web Crypto, etc.). Your input data never leaves your device. This applies to text, JSON, images, and every other input type.
Which browsers are supported?
JustConvert works in all modern browsers: Chrome 90+, Firefox 88+, Safari 14+, and Edge 90+. Some features (WebP output, Web Crypto API) require reasonably up-to-date browser versions. Internet Explorer is not supported.
Can I use the tools offline?
Once a page has loaded in your browser, the JavaScript converter logic will continue to work without a network connection. However, you need an internet connection to initially load the page and for advertising to display.
How do I search for a tool?
Press / or Ctrl+K (Cmd+K on Mac) from any page to focus the search bar on the home page. You can also use the category chips (Encoding, JSON, Text, Dev, Image) to filter tools by type.
What is the keyboard shortcut to copy output?
On standard converter pages (text input → text output), press Ctrl+Enter (Cmd+Enter on Mac) to copy the output to your clipboard. Most tools also have a visible Copy button.
Can I save my favorite tools?
Yes. Click the star (☆) icon on any tool card to save it as a favorite. Favorites are stored in your browser's localStorage and persist across sessions. Use the ★ Favorites chip on the home page to filter to your saved tools.
What image formats does the Image Resizer support?
You can upload any image format your browser supports (JPEG, PNG, WebP, GIF, BMP, SVG). The output can be saved as PNG, JPEG, or WebP. All processing is done on-device using the Canvas API.
Why does the image EXIF metadata viewer not show GPS coordinates?
EXIF GPS data is only present in photos taken with GPS-enabled devices (smartphones, GPS-equipped cameras). Photos taken with basic cameras, scanned images, or screenshots will not contain GPS data. Also, many social media platforms strip EXIF data when you upload photos.
The JSON formatter says my JSON is invalid — what do I do?
Use the Try to Fix button in the JSON Formatter tool. It uses the jsonrepair library to automatically correct common issues such as missing quotes, trailing commas, and unescaped characters. If the input is severely malformed, manual editing may be required.
Does the JWT decoder verify the signature?
Yes. The JWT Decoder automatically verifies HMAC-SHA signatures (HS256, HS384, HS512) using the Web Crypto API. Enter the signing secret in the provided field to see a verified or invalid signature status. RSA/ECDSA (RS/ES algorithms) display the header and payload but note that asymmetric verification is not supported.
Are there API endpoints I can call programmatically?
No. JustConvert does not provide a public API. All tool logic runs in the browser. If you need programmatic access to conversion functions, consider using the underlying open-source libraries directly (js-yaml, papaparse, marked, etc.).
How do I report a bug or request a new tool?
Use the Contact page to send us a message. For bugs, please include the tool name, a sample input that reproduces the issue, your browser and OS, and the expected vs. actual output. We aim to respond within 2–5 business days.
Why are ads shown on the site?
JustConvert is free to use and is supported by non-intrusive display advertising via Google AdSense. Ads allow us to keep all tools free and to cover hosting and development costs. You can opt out of personalized advertising at Google Ads Settings (g.co/adsettings).
How is my privacy protected?
JustConvert does not collect, store, or transmit your input data. We use anonymous analytics (Vercel Analytics) to understand aggregate usage patterns. Google AdSense may use cookies for personalized advertising — see our Privacy Policy for details and opt-out instructions.