Add your SMI file
Drop one or more .smi files onto the converter above, or browse for them. They load into browser memory only — nothing is uploaded, so there is no size-based pricing and no server queue.
SMI to TXT
Converting a .smi file to .txt extracts the document's content from its office package into a portable form. Free, private, and validated — the file never leaves your browser.
Private for supported formats — processed in your browser
Runs on your deviceConvert supported files
Drop SMI files here
Batch files can each use a different output. Nothing uploads for local conversions.
Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.About converting SAMI captions to Plain text
Converting a .smi file to .txt extracts the document's content from its office package into a portable form. An .smi file is a SAMI caption document: HTML-like markup in which <SYNC Start=…> elements mark the millisecond at which a caption appears, and the caption runs until the next SYNC. Microsoft designed it as an accessibility format, so a single file can carry several languages selected by CSS class.
A .txt file is plain text: nothing but a sequence of characters and line breaks, with no fonts, styles, or embedded objects. It is the lowest common denominator of documents — every computing device of the past several decades can open one. For this route the practical draw is opens everywhere, indefinitely — no format rot possible and the smallest possible representation of textual content — balanced against no formatting, images, or tables of any kind, which is worth knowing before you commit a large batch.
Why convert SMI to TXT?
The practical trigger for this conversion is usually a mismatch: with .smi, never formally standardised, so real-world files vary in structure. Switching to .txt buys you opens everywhere, indefinitely — no format rot possible, which is why it is the better fit for notes, to-do lists, and drafts that must outlive any particular app. Because the conversion runs locally, trying it costs nothing but a few seconds of compute on your own machine.
SMI vs TXT at a glance
| Aspect | SAMI captions (.smi) | Plain text (.txt) |
|---|---|---|
| Format type | Text-based — characters and structure, so there is no visual quality loss | Text-based — characters and structure, so there is no visual quality loss |
| How it stores data | the document has an HTML shape: <SAMI> wrapping <HEAD> with a <STYLE> block and <BODY> with the SYNC elements | no internal structure at all — bytes plus an assumed text encoding are the entire format |
| Strongest at | captioning legacy Windows Media and Silverlight content | notes, to-do lists, and drafts that must outlive any particular app |
| Weak spot | never formally standardised, so real-world files vary in structure | no formatting, images, or tables of any kind |
Pick TXT as the output
Select .txt in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if TXT is selectable, the route is real and validated.
Convert on your device
Press Convert. The package is unzipped in memory and its XML content parsed locally; nothing is uploaded.
Verify and download
Each result is signature-checked before the download unlocks, so a failed encode can never masquerade as a valid TXT file. Outputs keep the original filename with the .txt extension.
SMI to TXT questions, answered
Will converting SMI to TXT lose quality?
There is no visual quality to lose — smi is text-oriented and txt is text-oriented, so the question is structural fidelity. Text, ordering, and basic structure are preserved; complex layout, embedded objects, and styling beyond the target's model are simplified.
Is it private to convert SMI files here?
Yes — the .smi file is processed inside your browser tab and never uploaded. The package is unzipped in memory and its XML content parsed locally; nothing is uploaded. Close the tab and the file is gone from memory.
Where will the TXT file work?
Notepad, TextEdit, every code editor, every browser, and every phone open .txt without hesitation. It is the one document format with genuinely universal support across operating systems and decades.
Will the TXT file be bigger or smaller than my SMI?
It depends on the content: no internal structure at all — bytes plus an assumed text encoding are the entire format. Convert one representative file first and compare before batch-processing a large set.
What happens to the metadata in my SMI file?
In .smi, style-class and title information describes presentation and language selection, not the cues; conversion keeps timing and text. Re-encoding through the browser pipeline does not carry embedded metadata into the output, which doubles as a privacy scrub — check the exported file if you specifically need tags preserved.