1 MB PNG sample file
A PNG file of exactly 1,048,576 bytes. It is a valid Portable Network Graphics file, generated for this site and checked with an independent parser.
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sample-png-1mb.png
1 MB1,048,576 bytes
Download 1 MB PNG
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- Type
- image/png
- SHA-256
1ba30ec8f39345d59b82c1162d0f278e1ab22ae96dc7639443736275c9e05100- Direct URL
https://sampletestfiles.com/downloads/png/sample-png-1mb.png
What is in this file
A 677 × 515 test card. The pixel data sits in a deflate stream made of stored blocks, so the size is set by the pixel count. 1,953 bytes of tEXt comment chunk bring the file to the exact size.
| Dimensions | 677 × 515 px |
|---|---|
| Colour type | Truecolour RGB, 8 bits per channel |
| Transparency | No |
| Compression | Deflate stream of stored blocks |
| Interlaced | No |
First bytes of the file
The first 64 bytes of sample-png-1mb.png as a hex dump: offset, bytes, then the same bytes as text. The PNG signature is 89 50 4E 47 0D 0A 1A 0A.
00000000 89 50 4e 47 0d 0a 1a 0a 00 00 00 0d 49 48 44 52 |.PNG........IHDR|
00000010 00 00 02 a5 00 00 02 03 08 02 00 00 00 b2 ff f0 |................|
00000020 96 00 00 07 95 74 45 58 74 43 6f 6d 6d 65 6e 74 |.....tEXtComment|
00000030 00 53 61 6d 70 6c 65 54 65 73 74 46 69 6c 65 73 |.SampleTestFiles|Preview
Displays the file in your browser.
Where 1 MB matters
A 1,048,576-byte file: exactly the default upload limit of nginx, Spring Boot and Next.js. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| nginx | 1 MB by default (client_max_body_size) | A multipart upload of this file exceeds the limit by the size of the form boundaries. |
| Spring Boot multipart | 1 MB per file by default (max-file-size) | A file of exactly 1 MB is at the limit. |
| Next.js API routes and Server Actions | 1 MB by default | Larger bodies need the size limit raised in configuration. |
| Cloud Firestore documents | 1 MiB (1,048,576 bytes) | The same number of bytes as this file. |
| Apache Kafka messages | About 1 MB by default | Brokers reject larger records unless message.max.bytes is raised. |
Use this file for
- Download tests on mobile connections
- Verifying dimension limits
- Testing image uploads that must stay lossless
Testing notes for PNG
- Converting a transparent PNG to JPEG needs a background colour; pipelines that forget produce black backgrounds.
- Every chunk carries a CRC, so a strict decoder rejects a file that was altered in transit.
Technical details
| File name | sample-png-1mb.png |
|---|---|
| Format | PNG (Portable Network Graphics) |
| Extension | .png |
| MIME type | image/png |
| Size | 1,048,576 bytes (1 MB) |
| Kind | Binary |
| Signature | 89 50 4E 47 0D 0A 1A 0A |
| SHA-256 | 1ba30ec8f39345d59b82c1162d0f278e1ab22ae96dc7639443736275c9e05100 |
| Created | 2026-10-10 |
| Validation | Exact size, signature bytes and structure checked when the file was generated |
| Preview | Available on this page |
| Source | Generated for this site; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Images |
Validated for expected format and integrity. As with any download, scan the file with your own security tools before opening it. How files are made and checked
Download from the command line and verify
Fetch the file with curl, then compare its checksum with the SHA-256 value above.
curl -o sample-png-1mb.png 'https://sampletestfiles.com/downloads/png/sample-png-1mb.png'
sha256sum sample-png-1mb.png # Linux
shasum -a 256 sample-png-1mb.png # macOSOn Windows, run Get-FileHash sample-png-1mb.png -Algorithm SHA256 in PowerShell. A matching value proves that the download is complete and unaltered.
Related files
Questions about this file
- Is this file exactly 1 MB?
- Yes. It is 1,048,576 bytes, which is 1 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 1 MB PNG file?
- A 677 × 515 test card. The pixel data sits in a deflate stream made of stored blocks, so the size is set by the pixel count. 1,953 bytes of tEXt comment chunk bring the file to the exact size.
- Is there a sample with transparency?
- Yes. The curated library includes a 512 × 512 PNG with an alpha gradient.