Zamzar API review
A broad conversion API for teams processing many file types at scale.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Zamzar API is a cloud-based REST API for developers building file-conversion workflows. It handles documents, images, audio, video, CAD files, eBooks and other formats, with support for more than 1,100 conversion types. PDF workflows include PDF-to-TXT for text extraction and PDF-to-CSV for structured data extraction. Files can be imported and exported through HTTP, FTP, SFTP and Amazon S3, while official SDKs are available for Java, PHP and Python. It is a strong fit for applications that need broad format coverage without building separate conversion services for each file type.
The pricing structure scales by monthly conversion credits and file-size limits. TestFree includes 100 conversion credits, requires no card, allows files up to 1 MB, stores files for 1 day and has no overages. Startup costs $25 per month and includes 500 credits, a 50 MB maximum file size and 2-day storage. Growth costs $99 per month, includes 2,500 credits, unlimited maximum file size and 3-day storage. Scale costs $299 per month, includes 10,000 credits, unlimited maximum file size and custom conversions. The usage explorer and account-level credit monitoring help teams track consumption.
Its main strength is breadth: asynchronous jobs, multiple transfer methods, bearer-token or HTTP Basic authentication, and SDK support suit backend systems with varied input sources. The trade-off is focus. Zamzar API is designed around conversion and selected extraction workflows, not a complete PDF editing suite. Teams needing OCR, PDF merging, compression or general PDF editing should choose a product centered on those capabilities instead. Choose Zamzar API when format coverage, cloud delivery and scalable conversion credits matter most; choose an alternative when document manipulation is the primary requirement.
Zamzar API pros and cons
- Where it wins
- Converts files across more than 1,100 formats
- Supports asynchronous jobs and structured PDF extraction
- Connects through HTTP, FTP, SFTP and Amazon S3
- Where it doesn't
- PDF workflows focus on conversion rather than editing
- No OCR capability is included in the listed features
- Higher tiers are needed for larger files and heavier volume
Zamzar API fact sheet, pricing and score →
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