Your files should not become different files because you opened them in Eiswe.
What Eiswe can edit, inspect, import and recognise — with the limitations named rather than buried.
Support at a glance
Every row states its own limitation. Where a capability has not been confirmed against a shipped build, it says so rather than guessing.
Format by format
Eiswe works with the document format itself — open a .docx, edit it with styles, sections and comments, and save it back as the same file rather than a converted copy stored in a proprietary workspace.
Revisions and cross-device availability follow the same model as every other file. Very heavily formatted documents may not be reproduced in every detail.
Multi-sheet workbooks open with their structure, formulas and references, are edited as a workbook, and written back as .xlsx.
This is not a claim of complete Excel compatibility — some functions and very large workbooks behave differently.
Presentations open with their slides and layouts. Edit the content, reorder slides, then present, print or export as .pptx.
Advanced layout, transition and animation handling is not fully reproduced.
Open a PDF directly: annotate, fill forms, reorder pages, print and export while the page structure stays intact.
No perfect round-trip is promised. Specialised PDF features — unusual form logic, embedded media, signature workflows — are not all supported.
Simple files stay simple. Text opens as text, with its encoding and line endings preserved on save.
Nothing is added to the file that another editor would not understand.
Notes are the one thing that starts inside Eiswe rather than arriving as a standard file, so they are native Eiswe data — stored beside the work they describe, with attachments.
They still leave as ordinary text or Markdown, so a note is never trapped either.
Inspection, not authoring.
Eiswe opens technical drawings so you can look at them properly — layers, geometry, properties, measurements. It does not edit them.
The source drawing is never modified or written back. If you need to change geometry, that still happens in your CAD application.
Opening a file is not the same as reproducing an application.
Support has depth. A file can open perfectly and still contain a feature from its original application that Eiswe does not reproduce — a rare spreadsheet function, an unusual slide layout, a specialised PDF behaviour.
When that happens the useful answer is to say so. When Eiswe cannot safely edit something, the safer answer is read-only.
Format depth differs by platform
Beyond the first version
Grouped by what Eiswe does with them today. Direction is marked as direction — it is not a release commitment.
Need a format tested?
Eiswe is in active development, and real files are more useful to us than a list of extensions. Tell us the format and send a representative sample.
Only send files you are allowed to share. Nothing confidential, nothing under an agreement that forbids it.