Help center
Frequently Asked Questions
Answers about local file processing, browser compatibility, batch limits, accounts, workflows, failed conversions and zer.ai privacy.
Before you process an important file
Check the supported input and output formats on the tool page, keep the original and test one representative file before starting a large batch. Browser tools are convenient, but available memory, device speed and format complexity still matter.
Understanding local processing
“Processed in your browser” means the conversion code runs on your device for supported tools. It does not mean the website can load without a network connection on the first visit, and it does not eliminate normal web-server requests used to deliver the page and application files.
Working with batches
Batch limits describe what the interface accepts, not a guarantee that every device can decode the maximum queue. Large photos and long lossless audio files use much more memory than their compressed file size suggests. zer.ai processes supported queues sequentially, but a smaller batch may still be necessary on a phone or older computer.
Checking conversion results
Open at least one result in its destination application before deleting or replacing a source. For images, check dimensions, transparency and orientation. For audio, check duration, channels and audible quality. For subtitles, inspect timing and non-English characters. For archives, review filenames and the extracted folder structure.
Getting help
If the answer is not listed here, use the Contact page. Include the exact tool URL, browser, file type, approximate size and error message without disclosing a sensitive original file.
Frequently asked questions
Frequently asked questions
Are my files uploaded to zer.ai?
Supported file content is processed locally in your browser during normal use. Your browser still connects to the website to load the application, so ordinary hosting logs may contain network and page-request information, not the file contents being processed.
Do I need to create an account?
No account is required for the current core tools and workflows. If optional account-based features are introduced later, this page and the Privacy Policy will be updated.
What are the batch limits?
Image and audio batch interfaces can accept up to 100 files with a 500 MB combined browser limit. Practical capacity depends on the device, browser memory and file complexity.
Why can a conversion fail?
Common causes include damaged files, unsupported codecs, misleading file extensions, password-protected archives, insufficient browser memory and a format feature the selected output cannot preserve.
Which browsers work best?
Use a current version of Chrome, Edge, Firefox or Safari. Codec and WebAssembly support varies, so a format may work in one current browser and be unavailable in another.
Does zer.ai store my converted files?
No server copy is created for supported local processing. Download the result before closing or refreshing the page because the browser session is not permanent storage.
Can I process audio in batches?
Yes. Supported audio pages use a sequential queue, show per-file progress and can package successful outputs into a ZIP download.
Can zer.ai create RAR files?
RAR output pages are not offered because the current browser implementation cannot reliably create RAR archives. Supported archive outputs are shown on the relevant tool pages.
What is the difference between a tool and a workflow?
A tool performs one focused task. A workflow applies two or more connected steps to the same input, reducing repeated uploads, settings and downloads.
Are favorites synchronized between devices?
Current My Tools favorites are stored in the browser on the device where they were saved. They are not synchronized through an account.
Will zer.ai always be free?
Core tools currently require no account. Future optional paid features may include larger limits, advanced batches or saved workflows; any restriction will be displayed before processing.
Should I keep my original files?
Yes. Always keep an original and verify important outputs. Conversion can remove unsupported metadata, transparency, animation, subtitle styling or audio properties.