--- title: "How to Fax PDF, JPG, PNG, TIFF, and HEIC Files Online (2026)" description: "Learn which file formats work for online faxing, how to prepare PDF and image files, and how to fix quality or upload problems before sending." canonical: "https://www.onetimefax.com/blog/how-to-fax-file-formats/" --- # How to Fax PDF, JPG, PNG, TIFF, and HEIC Files Online (2026) Published: Tue May 12 2026 Updated: Wed Jul 22 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. Ready to send? [Upload your document to Onetime Fax](https://app.onetimefax.com/send). You can review the processed files and page count before paying. ## Supported Fax File Formats | Format | Best for | What to check | | ------------ | ----------------------------------------------------------- | ------------------------------------------------------------------ | | PDF | Multi-page forms, contracts, legal and government documents | Page order, signatures, and standard page size | | JPG or JPEG | Phone photos, IDs, receipts, and signed pages | Focus, lighting, crop, and text size | | PNG | Screenshots, forms, and text-heavy images | White background, complete content, and readable width | | TIF or TIFF | Scanned records and archived multi-page packets | Page count, contrast, and file integrity | | HEIC or HEIF | Photos captured on an iPhone | Rotation, lighting, and whether multiple pages should become a PDF | | WEBP | Images saved from browsers or modern apps | Resolution, contrast, and orientation | ## How to Fax Any Supported File 1. Open [Onetime Fax](https://app.onetimefax.com/send). 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](/blog/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](/blog/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. [Upload and fax your file](https://app.onetimefax.com/send) ## Frequently Asked Questions ### What file formats can I fax with Onetime Fax? Onetime Fax accepts PDF, JPG, JPEG, PNG, TIF, TIFF, HEIC, HEIF, and WEBP files. ### What is the best file format for faxing? PDF is usually best for multi-page documents because it preserves page order and layout. Clear image files work well for individual pages. ### Can I fax a photo from my phone? Yes. Upload a clear JPG, PNG, HEIC, HEIF, or WEBP image. Keep the page flat, evenly lit, and readable before sending. ### Can I fax a multi-page TIFF file? Yes. TIF and TIFF files can contain multiple pages. Check the processed page count before paying and sending. [← Back to Blog](/blog)