What file extensions does the File Upload support?

123FormBuilder is a free online form builder with file upload functionality. Users can collect files from their respondents through form submissions by adding file upload fields to the form.

All supported file extensions of the File Upload field are located in the Advanced tab, within the field editor. To allow only certain file extensions upon upload, select the field in the form layout and go to the Edit Field panel on the left. Next, click the tab Advanced and tick the box Accept only the following extensions. Afterwards, use the drop down to check the extensions you want to use.

File Upload support

Here is a list of the file extensions that the File Upload supports:

.3gp, .ai, .avi, .bmp, .cat, .cdr, .cod, .cpt, .csv, .dcm, .doc, .docx, .dpt, .dwg, .dxf, .eps, .exp, .flv, .gif, .hwp, .ico, .iges, .igs, .ipt, .jpeg, .jpg, .kit, .kmz, .m4a, .mdl, .mobi, .mod, .mov, .mp3, .mp4, .mpeg4, .msg, .oad, .oadx, .odt, .ogg, .org, .ott, .pdf, .png, .pps, .ppsx, .ppt, .pptx, .prt, .psd, .pub, .rar, .rtf, .slddrw, .sldprt, .step, .stf, .stl, .stl, .stp, .stp, .tif, .tiff, .txt, .wav, .wmv, .wpd, .wps, .x_t, .xls, .xlsx, .zip

Related articles:
How to upload multiple files?
How to style the file upload fields with CSS?
How to limit file upload size?
Do file upload fields work on iOS?
Why isn’t the file upload working on Safari?

Olivian Stoica
Olivian Stoica
Oli's enthusiasm for helping our fellow users led him to write thorough know-how articles and tutorials that would make form building a bliss on 123FormBuilder.


  1. Tim says:

    Hi guys,

    The new editor does not appear to have the “advanced” tab. I can’t select or review what file types are supported for upload.

    Please assist.

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