100 KB JSON test file
A JSON file of exactly 102,400 bytes, created instantly in your browser. Nothing is uploaded, and there is no sign-up.
Testing a limit? Grab the edge cases too
Need another size or name? Open it in the generator.
What’s inside the file
A small valid JSON object padded with whitespace, so JSON.parse() still succeeds at any size.
- Size: 102,400 bytes = 100 KB (binary) ≈ 0.10 MB (decimal)
- MIME type:
application/json - File name:
dummy-100kb.json
Will a 100 KB file upload?
How a 100 KB file compares with published limits (verified 2026-09-27):
| Service | Limit | 100 KB file |
|---|---|---|
| Gmail — email attachments (total per message) | 25 MB | Fits |
| Outlook.com — email attachments | 25 MB | Fits |
| Yahoo Mail — email attachments (total per message) | 25 MB | Fits |
| WhatsApp — documents / files | 2 GB | Fits |
| Discord (free) — file attachments | 20 MB | Fits |
| Slack — file upload | 1 GB | Fits |
| Facebook Messenger — files in chats | 100 MB | Fits |
| Notion (Free) — file upload | 5 MB | Fits |
| Trello (Free) — card attachment from computer | 10 MB | Fits |
| X (Twitter) — image | 5 MB | Fits |
| LinkedIn — document post (pdf, docx, pptx) | 100 MB | Fits |
| Shopify — product image | 20 MB | Fits |
| Typeform — file upload question | 10 MB | Fits |
Sources and 40+ more limits (servers, frameworks, cloud storage): file upload limits reference.
Good for testing
- API request-body limits (e.g. Express defaults to 100 KB)
- Config and data import
- Payload-size error handling
Questions
Is this 100 KB JSON exactly 102,400 bytes?
Yes. The file is exactly 102,400 bytes (100 KB with 1 MB = 1,024 × 1,024 bytes). If the system you test counts 1 MB as 1,000,000 bytes, use the 100,000-byte button instead.
Will the JSON file open?
A small valid JSON object padded with whitespace, so JSON.parse() still succeeds at any size.
Is it safe? Where does the file come from?
The file is created by JavaScript in your own browser when you click the button. Nothing is uploaded or downloaded from a server, and the file contains no macros, scripts or personal data.
More about the format: JSON format guide.