How to Fax PDF, JPG, PNG, TIFF, and HEIC Files Online (2026)

You can fax common document and image files directly from a browser. The important part is not the extension alone: every page must be complete, upright, high contrast, and readable after processing.

Supported Fax File Formats

How to Fax Any Supported File

1. Open Onetime Fax.
2. Enter the recipient’s fax number, including the country code for international destinations.
3. Enter your email address for delivery confirmation.
4. Upload one or more supported files.
5. Wait for processing, then verify the file list and page count.
6. Add an optional cover page.
7. Pay, send, and keep the delivery confirmation.

For the complete sending workflow, see How to Send a Fax Online.

PDF: Best for Multi-Page Documents

PDF is the safest default when page order and formatting matter. Use it for contracts, medical records, tax forms, court documents, and packets assembled from several sources.

Before uploading a PDF:

• Confirm every required page is present.
• Remove blank or duplicate pages.
• Check signatures, dates, and account numbers at normal zoom.
• Unlock password-protected files.
• Use Letter or A4 page sizes when possible.

JPG and JPEG: Best for Clear Photos

JPG and JPEG are the same format for faxing. They work well for one or two photographed pages, IDs, receipts, and signed forms.

Keep the camera parallel to the page, use bright even light, crop away the desk or background, and avoid digital zoom. If text is hard to read on your screen, it will usually be worse after fax transmission.

PNG: Best for Screenshots and Sharp Text

PNG preserves sharp edges and is useful for screenshots or exported forms. Crop browser controls and unrelated personal information, use a white background, and avoid very wide screenshots that shrink text when placed on a fax page.

If you have several PNG files, combine them into a PDF or verify their upload order carefully.

TIF and TIFF: Best for Scanned Records

TIF and TIFF are the same image format with different extension lengths. They are common in medical, legal, insurance, and document-archive systems.

TIFF files can contain one page or many pages. Allow extra processing time for a large multi-page file and confirm the resulting page count. If the file cannot be previewed locally or the page count looks wrong, re-export it from the scanner or convert it to PDF.

HEIC and HEIF: Best for iPhone Photos

iPhones often save photos as HEIC or HEIF. Onetime Fax accepts these files directly, so manual conversion is optional.

For one photographed page, upload the image as-is after checking its rotation and clarity. For several pages, the iPhone Notes scanner or Files app can create a single PDF with a predictable page order.

Fix Common File Problems

The text is blurry or faint

Rescan or retake the photo using even lighting and high contrast. Black text on a white background survives fax conversion best.

The page is sideways

Rotate the source image or PDF before uploading. Check every page, not just the first one.

The page count is wrong

Open the source file locally. Re-export damaged PDFs or TIFFs, and combine multiple images into one PDF when order matters.

The file is too large

Remove unnecessary pages or export a compressed PDF. Avoid aggressive image compression that makes small text unreadable.

The upload succeeds but the fax fails

The destination number or receiving machine may be the problem rather than the file. Verify the number and use the fax troubleshooting guide.

Final File Checklist

• Every page is present and in the correct order.
• Text and signatures are readable at normal zoom.
• Pages are upright and cropped.
• The fax number includes the correct area or country code.
• The processed page count matches the source document.
• Your email address is correct for delivery confirmation.