5 KB Avro sample
An Avro file of exactly 5,120 bytes. It is a valid Apache Avro object container file file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 5 KB sample, test or dummy Avro file.
Download
sample-avro-5kb.avro
5 KB5,120 bytes
Download 5 KB AvroCreated in your browser in a few seconds, then checked against the SHA-256 checksum. The file is not uploaded anywhere. No sign-up.
- Type
- application/avro
- SHA-256
6a71ebf5bbc9378773627da512830a6a75307b738ec6cc177cc9c988040a476c- Delivery
- Created in your browser from static generator assets (how it works).
What is in this file
An object container file whose header carries the writer schema as JSON, followed by 35 binary-encoded customer records in 5 blocks. 134 bytes of filler in an extra header metadata entry, which readers ignore, bring the file to the exact size.
| Records | 35 |
|---|---|
| Blocks | 5, of up to 100 records |
| Schema | Customer record, 12 fields |
| Types used | long, string, double, boolean, enum, union, and the uuid and date logical types |
| Codec | null (not compressed) |
| Sync marker | 16 bytes after every block |
First bytes of the file
The first 64 bytes of sample-avro-5kb.avro as a hex dump: offset, bytes, then the same bytes as text. The Avro signature is 4F 62 6A 01.
00000000 4f 62 6a 01 06 16 61 76 72 6f 2e 73 63 68 65 6d |Obj...avro.schem|
00000010 61 d0 0a 7b 22 74 79 70 65 22 3a 22 72 65 63 6f |a..{"type":"reco|
00000020 72 64 22 2c 22 6e 61 6d 65 22 3a 22 43 75 73 74 |rd","name":"Cust|
00000030 6f 6d 65 72 22 2c 22 6e 61 6d 65 73 70 61 63 65 |omer","namespace|Preview
Avro files cannot be shown in a browser. Download the file and open it in an application that reads Avro, such as Apache Spark, Flink and Hive.
Where 5 KB matters
A 5,120-byte file: larger than a cookie, smaller than a typical HTTP header limit. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Browser cookies | 4,096 bytes per cookie | 5 KB does not fit in one cookie. |
| Vite asset inlining | 4 KB by default (assetsInlineLimit) | A 5 KB asset is emitted as a separate file rather than inlined as base64. |
| nginx and Apache request headers | 8 KB per header line by default | 5 KB fits; the 10 KB sample does not. |
Use this file for
- Smoke tests in CI that must run in milliseconds
- Testing ingestion jobs and bulk loaders
- Checking schema resolution between a writer and a reader
Testing notes for Avro
- A logical type is an annotation on a plain type: a date is stored as an int counting days since 1970. A reader that ignores the annotation returns a number where a date was expected.
- An Avro message taken from Kafka is not a container file. It has no header and no embedded schema, only a schema ID, so tools made for .avro files cannot open it.
Technical details
| File name | sample-avro-5kb.avro |
|---|---|
| Format | Avro (Apache Avro object container file) |
| Extension | .avro |
| MIME type | application/avro |
| Size | 5,120 bytes (5 KB) |
| Kind | Binary |
| Signature | 4F 62 6A 01 |
| SHA-256 | 6a71ebf5bbc9378773627da512830a6a75307b738ec6cc177cc9c988040a476c |
| Created | 2026-10-23 |
| Validation | See the listed size and SHA-256. Small downloads are checked in the browser; verify streamed downloads manually. A hash match does not prove parser compatibility. |
| Preview | Not available for this file; details only |
| Source | Generated in your browser by this site's generator; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Data |
Check the stated structure and checksum against your application requirements. As with any download, scan the file with your own security tools before opening it. How files are made and checked
Verify your copy
This file is created in your browser, so it has no direct URL for curl or wget. The generator is designed to produce reproducible bytes. After saving, compare the checksum with the SHA-256 value above.
sha256sum sample-avro-5kb.avro # Linux
shasum -a 256 sample-avro-5kb.avro # macOSOn Windows, run Get-FileHash sample-avro-5kb.avro -Algorithm SHA256 in PowerShell. For scripts and pipelines, save the file once and keep your own copy.
Related files
Questions about this file
- Is this file exactly 5 KB?
- Yes. It is 5,120 bytes, which is 5 KB in the binary units that operating systems and server limits use (1 KB = 5,120 bytes).
- What is inside the 5 KB Avro file?
- An object container file whose header carries the writer schema as JSON, followed by 35 binary-encoded customer records in 5 blocks. 134 bytes of filler in an extra header metadata entry, which readers ignore, bring the file to the exact size.
- What schema do the Avro samples use?
- A Customer record of twelve fields: a long, strings, a double, a boolean, an enum, a union with null, and two logical types, uuid and date. The schema is in the header of every file as JSON.