Reduce PDF file size by up to 90% while preserving visual quality, using an industry-grade Ghostscript-tiered compression engine. Choose basic, medium, or maximum compression to balance size and quality. Perfect for email attachments, web uploads, document archiving, and storage optimization. Upload a PDF and receive a downloadable compressed file with before/after size metrics. Fast, reliable, and production-ready for any document workflow.
{"success":true,"url":"https://pub-6db99bab215e44889f46c4b2a619f8c5.r2.dev/compressed/20260619/bb30c136-f449-4428-8aee-73a1765cde47.pdf","original_size":2526695,"compressed_size":2317882,"compression_ratio":0.9173572591864075,"space_saved_percent":8.264274081359247,"quality_score":0.95,"processing_time":"7149ms"}
curl --location 'https://zylalabs.com/api/12963/pdf+compression+and+optimizer+api/25880/compress+pdf?level=basic&preserve_quality=basic' \
--header 'Content-Type: application/json' \
--form 'image=@"FILE_PATH"'
After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the PDF Compression and Optimizer API simply include your bearer token in the Authorization header.
| Header | Description |
|---|---|
Authorization
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Required
Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.
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No long-term commitment. Upgrade, downgrade, or cancel anytime. Free Trial includes up to 50 requests.
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The PDF Compression and Optimizer API reduces the file size of PDF documents while maintaining readability and visual appearance. The API accepts a PDF file as input, applies compression and optimization techniques, and returns a downloadable version of the compressed document along with file size statistics.
Users can select different compression levels to balance file size reduction and document quality. Available compression modes include basic, medium, and maximum, allowing developers to choose the most suitable option for their use case. The API can also preserve visual quality during compression to help maintain the appearance of text, images, graphics, and document layouts.
The API is designed for workflows that require smaller PDF files for storage, sharing, uploading, or distribution. Compressed files can reduce storage requirements, improve transfer speeds, decrease bandwidth usage, and help meet file size restrictions imposed by email systems, document portals, and cloud platforms.
Common use cases include:
Reducing PDF size for email attachments
Optimizing files before uploading to websites
Preparing documents for cloud storage
Compressing reports, invoices, and contracts
Reducing storage requirements for archived documents
Optimizing scanned PDF files
Processing large volumes of PDF documents
Automating document management workflows
Preparing files for document sharing platforms
Reducing bandwidth usage during file transfers
Features:
PDF file compression and optimization
Multiple compression levels
Basic, medium, and maximum compression modes
Optional visual quality preservation
File size reduction reporting
Original and compressed file size metrics
Compression ratio information
Downloadable compressed PDF output
JSON response format
HTTPS-based API access
The API returns structured JSON responses containing a download URL for the compressed file, along with information such as original file size, compressed file size, compression ratio, and processing details. It can be integrated into document management systems, cloud storage platforms, workflow automation tools, business applications, web services, and other systems that process PDF documents.
To obtain your API key, first sign in to your account and navigate to the API you want to use. From the API's Pricing section, choose a plan and complete the subscription process. Once subscribed, return to the API page and you will see your API Access Key displayed at the top of the documentation page. You can use this key to authenticate your requests.
You can’t switch APIs during the free trial. If you subscribe to a different API, your trial will end and the new subscription will start as a paid plan.
The free trial lasts for 7 days and allows you to make up to 50 API requests.
No, the free trial is available only once, so we recommend using it on the API that interests you the most. Most of our APIs offer a free trial, but some may not include this option.
Yes. If the API offers a free trial, you will see a "Free 7-Day Trial" option in its Pricing section. The trial lasts for 7 days and allows up to 50 API requests, enabling you to evaluate the API before subscribing to a paid plan.
Zyla API Hub is like a big store for APIs, where you can find thousands of them all in one place. We also offer dedicated support and real-time monitoring of all APIs. Once you sign up, you can pick and choose which APIs you want to use. Just remember, each API needs its own subscription. But if you subscribe to multiple ones, you'll use the same key for all of them, making things easier for you.
You can monitor your API usage through the response headers included with every request:
x-zyla-api-calls-monthly-used: Shows the total number of API requests you have used during the current billing period.
x-zyla-api-calls-monthly-remaining: Shows the number of API requests you have remaining for the current billing period.
Yes, you can cancel your subscription at any time. Simply go to the Pricing section of the API you're subscribed to and click the "Unsubscribe" button.
Please note that upgrades, downgrades, and cancellations take effect immediately. Once your subscription is canceled, access to the service will end immediately, regardless of any remaining API calls in your quota.
Please have a look at our Refund Policy: https://zylalabs.com/terms#refund