OpenAPI / Swagger JSON Compressor
Paste an OpenAPI 3.x or Swagger 2.0 JSON specification to remove descriptions, examples, and x- extensions — reduces spec size for SDK generation pipelines and API gateway imports. Runs entirely in your browser with no signup required.
Paste an OpenAPI 3.x or Swagger 2.0 JSON specification to remove descriptions, examples, and x- extensions — reduces spec size for SDK generation pipelines and API gateway imports. Runs entirely in your browser.
Compression Options
Why Use Our OpenAPI Compressor?
Instant OpenAPI Spec Compression
Paste any OpenAPI 3.x or Swagger 2.0 JSON spec and compress it instantly in your browser — removes descriptions, examples, and x- extensions in milliseconds.
Secure OpenAPI Compressor Online
Your API specification never leaves your device. All compression runs locally in the browser — safe for internal or proprietary API specs containing sensitive endpoint information.
Granular Compression Options
Choose exactly what to remove — descriptions, summaries, examples, x- extensions, deprecated flags, or JSON whitespace — with a live preview of the compressed output.
100% Free Forever
Compress as many OpenAPI specs as you need, completely free. No account, no subscription, no file size limits, and no ads.
Common Use Cases for OpenAPI Compressor
SDK Generation Pipelines
Strip descriptions and examples before feeding the spec to OpenAPI Generator or Swagger Codegen — reduces generator memory usage and speeds up SDK build times for large specs.
API Gateway Import
Compress OpenAPI specs before importing to AWS API Gateway, Azure API Management, or Kong — many gateways have payload size limits that large specs with verbose descriptions can exceed.
CI/CD Pipeline Optimization
Add OpenAPI compression to your build pipeline — compress the spec before validation, linting, and code generation steps to reduce artifact size and pipeline execution time.
API Versioning & Distribution
Distribute a minimal spec to API consumers for client generation while keeping the full documented spec for internal use — strip descriptions for the public distribution artifact.
Removing Internal Metadata
Strip x- extension fields containing internal IDs, rate limit configs, and team metadata before publishing the spec publicly — removes proprietary information from the public API contract.
Spec Storage & Version Control
Commit a compressed spec to version control alongside the full spec — reduces repository size and makes diffs easier to review by removing verbose description changes.
Understanding OpenAPI Spec Compression
What is OpenAPI Spec Compression?
OpenAPI spec compression is the process of removing documentation-only fields from an OpenAPI JSON specification to reduce its size for programmatic use cases like SDK generation, API gateway imports, and CI/CD pipelines. Large OpenAPI specs can reach several megabytes when they include verbose descriptions, inline examples, and vendor extension fields — none of which are needed for code generation. Our free OpenAPI compressor strips these fields in your browser and shows exactly what was removed.
How Our OpenAPI Compressor Works
- Paste Your Spec: Copy your OpenAPI 3.x or Swagger 2.0 JSON specification and paste it into the input panel. Use the example button to load a sample spec.
- Choose Compression Options: Select which fields to remove — descriptions, summaries, examples, x- extensions, deprecated flags, or JSON whitespace. The output updates instantly.
- Copy or Download: Copy the compressed spec to your clipboard or download it as a .json file — then use it in your SDK generator or API gateway.
What Gets Removed During Compression
- Descriptions: All
"description"fields from paths, operations, parameters, request bodies, responses, and schemas — documentation only, not used by generators. - Examples:
"example"and"examples"fields from schemas and parameters — used only for documentation rendering. - x- Extensions: All vendor extension fields starting with
x-— internal metadata added by API management tools. - JSON Whitespace: All indentation, newlines, and spaces between tokens — produces a single-line minified JSON output.
What Is Preserved
All structural fields required for SDK generation and API gateway imports are fully preserved: paths, HTTP methods, operation IDs, parameters (name, in, required, schema), request bodies, response status codes, response schemas, component definitions, security schemes, and server URLs. The compressed spec is functionally identical to the original for all programmatic use cases.
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Frequently Asked Questions About OpenAPI Compressor
An OpenAPI compressor removes verbose fields like descriptions, examples, and x- extensions from OpenAPI JSON specifications to reduce their size for SDK generation, API gateway imports, and CI/CD pipelines. Our free online OpenAPI compressor runs entirely in your browser — no signup or server upload required.
No. SDK generators (OpenAPI Generator, Swagger Codegen, Kiota) only use the structural fields — paths, operations, parameters, request bodies, response schemas, and component definitions. Descriptions and examples are documentation-only fields that do not affect generated code. The compressed spec produces identical SDK output.
Yes, complete privacy is guaranteed. All compression runs entirely client-side in your browser. Your OpenAPI specification — which may contain internal endpoint paths, authentication schemes, and proprietary data models — never leaves your device and is never uploaded to any server.
Yes. The OpenAPI compressor is 100% free with no signup, no subscription, no spec size limits, and no ads. You can compress as many specs as you need.
In OpenAPI 3.x, "summary" is a short one-line description of an operation (shown in API documentation navigation), while "description" is a longer markdown-formatted explanation. Both are documentation-only fields — removing them has no effect on SDK generation or API gateway behavior.
x- extension fields are vendor-specific metadata added by API management tools, gateways, or internal tooling (e.g. x-rate-limit, x-internal-id, x-amazon-apigateway-integration). They are safe to remove for SDK generation but may be required for specific API gateway imports. Check your gateway documentation before removing them.
Yes. The compressor works with both Swagger 2.0 (swagger: "2.0") and OpenAPI 3.0/3.1 (openapi: "3.x.x") JSON specifications. The same fields (descriptions, examples, x- extensions) exist in both formats and are removed by the same logic.
The current version of the compressor only supports JSON input. To compress a YAML spec, first convert it to JSON using a YAML-to-JSON converter, then compress it here. We plan to add native YAML support in a future update.