Zamzar API

Zamzar API is a cloud-based REST HTTP service for adding file conversion to mobile, web, or desktop applications. It supports more than 1,100 conversion types across documents, video, images, audio, eBooks, CAD, 3D, and compressed files. Applications can send files from a user's machine or use files available through HTTP, FTP, SFTP, or Amazon S3. Zamzar says its service can scale from one file to 10,000. Developers can use official Java, PHP, and Python SDKs, along with code samples for C#, cURL, Node.js, and other languages. The free Test plan costs nothing and requires no card; it includes 100 conversion credits, a 1 MB maximum file size, one-day file storage, and a three-day support response. Paid plans start at $25 /mo. Successful conversions use at least one credit, the first 50 MB of input is included in the conversion cost, and unused monthly credits do not roll over. Zamzar describes the API as a conversion tool rather than file hosting: converted files should be downloaded through the API. Accounts include sandbox testing at no cost, subject to file-size and job-count limits.

Zamzar API offers broad format coverage and several ways to integrate conversion into an application. The free Test plan has a 1 MB file limit, while paid plans start at $25 /mo and unused monthly credits expire.

It suits developers adding file conversion to an application or service workflow. The available SDKs and code samples support teams working in several programming languages.

Zamzar API is a cloud REST service for developers adding file conversion to mobile, web, or desktop products. It suits teams handling many file types and storage sources, especially when demand can vary sharply. The main trade-off is operational: credits expire monthly, file-size ceilings differ by plan, and converted files must be retrieved through the API rather than treated as hosted content.

Overview

Zamzar covers more than 1,100 conversions spanning documents, video, images, audio, eBooks, CAD, 3D, and compressed files. That breadth makes it a practical general-purpose conversion layer instead of a specialist for one media category. Inputs can come from a user's machine or from HTTP, FTP, SFTP, and Amazon S3, with those same storage and transfer options listed as integrations.

The service is cloud-based and says it can scale from a single file to 10,000, which fits applications whose conversion volume changes over time. Scaling does not eliminate plan limits: credit allowances, maximum input sizes, storage windows, and overage rates determine the real operating cost. Zamzar explicitly positions the API for conversion, not CDN duties, so applications need to download completed files through the API.

Key features

Developer integration

Official SDKs for Java, PHP, and Python are a meaningful advantage for teams working in those languages. Samples for C#, cURL, Node.js, and other languages provide starting points when an official SDK is not available, but they do not remove the implementation work of building job handling into an application.

Testing and security

A Test account requires no credit card, and every account includes sandbox mode for conversion jobs at no cost. The free environment remains constrained by file-size and job-number limits, so it is suitable for integration checks rather than realistic large-file evaluation. Test files are stored for only one day.

Zamzar describes TLS protection for traffic, salted and hashed API passwords, firewalls, access controls, regular patching, and monthly external security scans. It also states that it meets GDPR, UK GDPR, and Data Protection Act 2018 responsibilities and is registered with the UK Information Commissioner's Office. Support response targets range from one to three days by plan, with a support team staffed by software developers.

Credits and bandwidth

Successful conversions cost at least one credit. The first 50 MB of input is included in that conversion cost, but unused monthly credits do not roll over. That favors steady usage; teams with seasonal demand should avoid buying substantially more credits than they can consume.

Pricing

Startup is the lowest paid entry point, but its 50 MB ceiling can rule out substantial media and document jobs. Growth removes the stated maximum file size and lowers unit and overage pricing, making its higher fixed fee easier to justify when volume or file size is unpredictable. Scale further reduces per-credit cost and adds custom conversions and faster support, but its $299 monthly commitment only makes sense for substantial usage. Every paid plan must be managed around expiring monthly credits.

Platforms

The API supports Android, iOS, Linux, macOS, Windows, and web applications through its HTTP interface. Its deployment model is cloud, so teams embed conversion into products across those environments rather than installing a local conversion engine.

Who it's for

Zamzar is aimed at developers building conversion into an application's workflow, particularly products that accept varied document, media, archive, CAD, or 3D formats. It is a strong fit when inputs already live on HTTP, FTP, SFTP, or S3 and when a team values SDKs and broad format coverage. It is less suitable for simple one-off desktop conversion, CDN-style file delivery, or workloads that cannot tolerate monthly credit expiry and plan-based file limits.

Pros and cons

Pros

• More than 1,100 conversions: one API can cover many file families instead of forcing separate specialist services.
• Flexible file sources: local files and HTTP, FTP, SFTP, and S3 inputs match common application storage patterns.
• Cloud scaling: the stated one-to-10,000-file range suits variable demand.
• No-card evaluation: Test access and sandbox mode lower the barrier to integration work.
• Developer-oriented tooling: SDKs and samples shorten the path to implementation.

Cons

• Credits expire: unused monthly allowances do not roll over, creating waste for uneven demand.
• Free tier is tiny: the 1 MB Test limit is insufficient for many real production files.
• Retrieval is required: the API is not intended to host converted files as CDN content.
• Paid capacity escalates: unlimited file size begins at Growth, while Scale costs $299 per month.

Alternatives

FreeConvert GIF Maker is a better match when the job centers on GIF creation and a consumer-facing free tier with daily conversion-minute limits is sufficient.

Aspose.Imaging suits teams wanting an imaging-focused option with a browser app and self-hosted platform coverage.

Convertio is worth considering for users who prefer a broader app and extension presence with a lower-priced Lite plan.

CloudConvert Audio Converter is the more targeted choice for audio workflows, including a free daily-credit allowance.

ImageCool Converter fits Windows users seeking a one-time desktop image-conversion purchase.

Photopus is a Windows desktop alternative with a one-time Pro license and trial access.

Quick Any2Ico is for Windows users specifically creating icon files rather than embedding a general API.

Universal Image Converter is the straightforward free, open-source desktop option for Windows image conversion.

For category browsing, see Image Converter Software, PDF API Software, and File Conversion Software.

Verdict

Choose Zamzar API when your application needs unusually broad format coverage, multiple input routes, and a cloud service that can absorb changing conversion demand. Its SDKs, sandbox, and no-card Test plan make integration approachable, but production buyers must monitor expiring credits, file-size thresholds, and overages. Look elsewhere if you need permanent credit carryover, CDN-style hosting, or a simple one-time desktop converter.