Doconut.app is not one viewer but seventeen, one per format family, each with its own page and its own size ceiling. The home page will route a file for you, but it helps to know where things live — a few formats are not where people assume.

Choosing the right viewer for a file format

Comprehensive Format Support

Seventy-plus extensions, grouped by the viewer that handles them:

PDF: .pdf — 25 MB.
Word: .doc, .docx, .odt, .rtf, plus .docm, .dot, .dotx, .dotm and .ott — 15 MB.
Excel: .xls, .xlsx, .csv, .ods, plus .xlsm, .xlsb, .xltx and .xltm — 20 MB.
PowerPoint: .ppt, .pptx, .odp, plus .pptm, .ppsx, .ppsm, .pot, .potx and .potm — 20 MB.
CAD: .dwg, .dxf, .dgn — 10 MB. DWG is a drawing, not an image, which is the mix-up that sends people to the wrong page.
PSD: .psd — 25 MB. Photoshop's working file gets its own viewer because it is not a picture; it is layers, masks and editable type.
Email: .eml, .msg, .emlx — 10 MB.
Visio: .vsd, .vsdx and the stencil and template variants — 25 MB.
Project: .mpp, .mpx — 20 MB. Not .xml, and not .mpt.
TIFF, eBook (.epub), RTF, XML, HTML and Text.
Images: .jpg, .jpeg, .png, .gif, .bmp, .webp, .jpe, .avif — 25 MB.
Vector & raw images: .svg, .tiff, .ico, .dng, .cdr, .cmx, .tga, .eps, .emf, .wmf, .jp2 — 25 MB. This is where SVG and camera raw live, not with the ordinary photographs.

One exclusion worth stating: DICOM (.dcm, .ima) is deliberately not supported on the free viewers.

User-Friendly Interface

Several extensions are accepted by more than one viewer, which is intentional rather than a mistake — and it is why the same file can have two different size limits depending on which page you use:

.rtf goes to the Word viewer and the RTF viewer at 15 MB, and to the Text viewer at 5 MB.
.xml and .html have viewers of their own and are also accepted by the Text viewer, all at 5 MB.
.tiff is handled by the dedicated TIFF viewer and by the vector and raw image viewer; .webp by the ordinary image viewer and the vector and raw one. All at 25 MB.

If you land on the wrong page the uploader refuses the file and names what it accepts, so nothing is lost by guessing.

No Installation Required

One of the standout features of Doconut.app is that it requires no software installations. Users can access documents instantly without creating an account. This hassle-free setup makes Doconut.app an ideal choice for users who value simplicity and efficiency.

Cross-Device Compatibility

Whether you are using a smartphone, tablet, or desktop computer, Doconut.app is optimized for all devices. The platform ensures a consistent viewing experience, so you can access your documents anytime, anywhere, without compromising on usability.

Privacy Assurance and Secure Connection

No uploaded document is stored after viewing: the file is rendered in a temporary session tied to your browser and deleted when that session ends. The upload runs over HTTPS, and there is no account to attach anything to.

We claim no security certification — no ISO 27001, no SOC 2, no HIPAA. For documents that must stay inside your own network, use software you host yourself.

All seventeen give you page navigation, zoom, fit-to-window and printing with Ctrl+P. Search works where the document carries a text layer — there is no OCR, so a scanned page has nothing to search.

A few add something specific to their format: the CAD viewer lets you switch layers off and measure distances and areas; the email viewer shows the full header trail and lists attachments separately; the vector and raw viewer shows a photograph's EXIF beside the image.

Why Choose Doconut.app?

What it is good for:

Opening a format you have no software for, without installing any
Reading a file on a locked-down machine where you have no admin rights
Checking what is inside a document before forwarding it
Not leaving a copy behind, on your disk or on ours

Key Takeaways

Seventeen viewers, one per format family, each with its own page and ceiling.
70+ extensions, from PDF to DNG — but not DICOM.
No installation and no account.
HTTPS in, deleted afterwards, with no certification claimed.
Viewing only — no conversion, no editing, no batch upload.

If you are not sure which viewer yours needs, drop the file on the home page and it will find the right one.