Avro Viewer | Avro to JSON Converter Online

Avro viewer that opens .avro files in your browser: browse records in a table, read the schema, export to JSON or CSV. Reads deflate and snappy files. Free. Designed specifically for developers and professionals, this free online viewer runs entirely in your browser to process tasks quickly and securely. Enjoy unlimited usage with no data tracking and no registration required.

Also known as: avro viewer online · avro to json converter online · avro to json · avro file reader · open avro file online · avro schema viewer · avro to csv · kafka avro file viewer

json tools

sql and database tools

file converters

viewers

Avro File

Drop an .avro file here, or click to browse

Read locally with the File API. Nothing is uploaded.

Records

Records will appear here as a table, 100 per page

About Avro Viewer

An Avro viewer is used to read an Apache Avro data file without writing code or installing avro-tools. Drop in an .avro container file, such as one written by a Kafka Connect S3 sink or a Spark job, and the viewer shows its records in a searchable table, the writer schema from the file header, and lets you export the data as JSON or CSV.

Key Features

Reads Avro object container files with the null, deflate and snappy codecs, verifying each snappy block's CRC32
Decodes records, enums, arrays, maps, unions, fixed and recursive schemas, including names resolved across namespaces
Shows logical types as readable values: decimals, dates, time-millis, timestamp-millis and timestamp-micros, UUIDs and durations
Keeps 64-bit longs exact instead of rounding them to JavaScript numbers
Indexes blocks first and decodes only the page you are viewing, so a 200,000-record file opens in milliseconds
Searches every record and exports all records, or only the matches, as JSON or CSV

Use Cases

Check what a Kafka Connect S3 sink wrote to an s3://bucket/topics/orders/ prefix in us-east-1
Inspect a Spark or Flink job's Avro output before loading it into BigQuery or Snowflake
Read the writer schema of an .avro file to debug a schema evolution error
Convert a small Avro extract to CSV for a teammate who works in Excel or Google Sheets
Confirm that decimal and timestamp columns carry the values you expect

Supported Formats

.avro

Avro object container file

null, deflate and snappy codecs

JSON export

CSV export

Related Keywords

avro viewer

avro viewer online

avro to json converter online

avro to json

avro file reader

open avro file online

avro schema viewer

avro to csv

kafka avro file viewer

How do I convert an Avro file to JSON?

Open the .avro file here and click the download button in the Records card: every record is written to a JSON array, with logical types turned into readable strings such as 2026-09-01 for a date and 47.12 for a decimal. Bytes and fixed values appear as hex. Avro container files embed their own schema, so no .avsc file is needed. Files that use the zstandard, bzip2 or xz codecs must be recompressed first, for example with avro-tools recodec.

Your data stays on your device

The file is read with the browser's File API and decoded in JavaScript. Records are never uploaded; only the file name and the header summary are kept in this tool's auto-save.

Liked this tool?

DevToolLab is free to use. If this viewer saved you some time today, please consider supporting our work.

Buy us a coffee ☕

Frequently asked questions

What is Avro Viewer used for?

Avro viewer that opens .avro files in your browser: browse records in a table, read the schema, export to JSON or CSV. Reads deflate and snappy files. Free.

Is Avro Viewer free to use?

Yes. Avro Viewer is completely free with no usage limits, and there is no paid tier required to use it.

Do I need an account to use Avro Viewer?

No. Avro Viewer works immediately in your browser with no signup, login, or email address required.

Related Tools

JSON Viewer Online | Explore JSON Tree Structure Free

View and explore JSON data in an interactive collapsible tree structure. Search, filter, and navigate nested objects and arrays. Free online JSON viewer with no signup required.

json tools

viewers

Swagger Viewer Online | Free OpenAPI Viewer

Swagger viewer and OpenAPI explorer online. Load a spec from a URL or paste JSON/YAML, browse endpoints and schemas, and send live test calls. Free.

json tools

api and http tools

CSV Viewer Online | CSV File Reader

CSV viewer online: open a CSV from a URL, upload a file, or paste data, then search, sort, and filter it in a clean table. Shareable ?url= links, custom delimiters, large files.

csv and spreadsheet tools

url and link tools

More Tools You Might Like

Pastebin Online | Share Code & Text Snippets Free

Popular

Share code snippets, logs, and text with a shareable link. Syntax highlighting for 30+ languages, expiration controls, and password protection for Pro users.

text tools

password and key generators

math calculators

utilities

Use Tool

URL Tracker & Link Shortener | Track Clicks

Popular

Create short, trackable URLs with detailed click analytics. Track visitor location, devices, referrers, and more. Password protection & QR codes included.

text tools

password and key generators

url and link tools

networking

Use Tool

Webhook Receiver & Inspector | Test HTTP Webhooks

Popular

Generate a unique URL to easily test, receive and inspect HTTP webhooks in real-time. View request headers, query parameters, JSON payloads, and more.