HEIF to FAX Converter

Quick HEIF to FAX — convert your images online for free

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Quick Conversion

Speed is central to the experience — upload your HEIF and the FAX is ready for download almost immediately after processing.

Universal Access

Convert HEIF to FAX from any device — Windows, macOS, Linux, or mobile. All you need is a browser and an internet connection.

Bulk Conversion

Process entire collections of HEIF images at once — batch conversion to FAX eliminates the need to handle files one at a time.

How to convert HEIF to FAX

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose fax or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your fax file right afterwards

About formats

HEIF (High Efficiency Image File Format) is a container format for images and image sequences standardized by the Moving Picture Experts Group as ISO/IEC 23008-12, first published in 2015. HEIF is built on the ISO Base Media File Format (ISOBMFF, the same container used for MP4 video), providing a flexible structure that can hold single images, image collections, image sequences (like animations or bursts), and derived images with non-destructive editing operations. The container is codec-agnostic — while the most common implementation pairs HEIF with HEVC/H.265 compression (branded as HEIC by Apple), the standard also accommodates AV1 compression (creating the AVIF variant), H.266/VVC, and other future codecs. HEIF supports features that JPEG lacks: 10-bit and 12-bit color depth, wide color gamuts (Display P3, BT.2020), lossless compression, alpha transparency, depth maps, thumbnail images, and Exif/XMP metadata — all within a single file. Auxiliary image items can store computational photography data like depth maps, HDR gain maps, and semantic segmentation masks. One advantage is the format's future-proof architecture: by separating the container from the codec, HEIF can adopt newer, more efficient compression technologies without changing the file structure, metadata handling, or application-level APIs. The substantial compression improvement over JPEG is another core strength — HEVC-based HEIF typically achieves 40-50% file size reduction compared to JPEG at the same visual quality, beneficial for storage and bandwidth. HEIF is supported by Apple's ecosystem (iOS, macOS), Windows 10/11, Android 10+, GIMP, ImageMagick, and Adobe products.
Initial release: 2015
FAX is a generic image file extension associated with facsimile transmission formats standardized by the ITU-T (formerly CCITT), with the underlying Group 3 compression standard ratified in 1980. FAX files typically contain monochrome (1-bit, black and white) image data compressed using the Modified Huffman (MH) encoding defined in ITU-T Recommendation T.4, which assigns variable-length codes to run lengths of consecutive white or black pixels along each scanline. The standard resolution for Group 3 fax is 204x98 dpi (normal mode) or 204x196 dpi (fine mode), reflecting the capabilities of thermal and laser fax machines of the era. FAX files encountered digitally are often raw Group 3 encoded bitstreams or TIFF wrappers with CCITT Group 3 compression (TIFF compression tag 3). The Group 3 encoding scheme is highly efficient for typical business documents — pages with mostly white space and black text — achieving compression ratios of 10:1 to 20:1 compared to uncompressed bitmaps. One advantage is universal fax system compatibility: Group 3 encoding is the mandatory baseline for all fax machines worldwide, meaning FAX files contain data in exactly the format transmitted over telephone lines, preserving the original fax data without transcoding losses. The format's role in business communications history provides another dimension — billions of fax transmissions using this encoding moved legal documents, medical records, and business correspondence for decades, and archived FAX files represent an important documentary record. FAX images can be viewed and converted using LibreOffice, ImageMagick, GIMP, and standard document management systems.
Developer: ITU-T
Initial release: 1980

Frequently Asked Questions

Why would I convert HEIF to FAX?

Despite HEIF's quality advantages, compatibility gaps persist on Windows and web — converting to FAX eliminates viewer and upload restrictions.

Which apps support FAX?

FAX files can be opened with Windows Fax Viewer, IrfanView, XnView, and fax processing software.

How fast is the HEIF to FAX conversion?

Conversion typically takes just a few seconds — HEIF images are processed on powerful servers and the FAX output is ready almost immediately.

Is my HEIF file safe during conversion?

Convertio prioritizes privacy — your HEIF file is deleted after conversion completes, and the FAX result is automatically removed within 24 hours.

Is HEIF to FAX conversion free?

Converting HEIF to FAX is free at Convertio. For heavier workloads or extra features, paid plans provide additional capacity.

How long are converted files stored?

Converted FAX files remain available for download for up to 24 hours, after which they are automatically deleted from Convertio servers.