Open OTDR files from any instrument in the browser: .sor, .msor, EXFO and Anritsu .trc, Fluke .tst, VIAVI .csor and more. Measure, save as .sor, get a PDF report. Free without sign-up; Professional adds whole-cable reports, batch edits and projects.
This page is designed to help you find out whether OTDR Master is good and if it is the right choice for you.
OTDR Master is a web app for reading and working with OTDR trace files. You drop a file on the page and see the trace, the event table and the loss figures. Nothing to install, and it works on Windows, Mac, Linux and phones.
What it opens
.sor files (Telcordia SR-4731 / Bellcore GR-196).zip, .7z and .rar archives with many traces inside, without unpackingFree
.sorProfessional
The interface is available in 15 languages, including English, Spanish, Portuguese, Vietnamese, Thai, Indonesian, Chinese and Russian.
There are also free calculators on the site: PON link budget, fiber loss budget, dead zone, and fiber color code.
Listed in
File formats supported
.sor, .msor, EXFO and Anritsu .trc, Fluke .tst, VIAVI .csor and more, about twenty formats
Archives
.zip, .7z and .rar open without unpacking
Measurements Analytics
Cursors A and B, 2-point and LSA loss, event table with thresholds
Editing
Events, metadata and the curve; the result saves as .sor
Trace comparison
Up to 8 traces on one chart free, 48 on Professional
Bidirectional analysis
A-B and B-A traces paired, with the average of the pair
PON mode
Name the splitter ratio and see the excess loss
Reports
PDF sheet per measurement, unlimited on every plan
Whole-cable reports
Summary table, PDF per fiber, Excel workbook (Professional)
Sharing
A link to the trace, plus a QR code on the report
Languages
15 interface languages
Installation
None, runs in the browser
It opens OTDR trace files in the browser. You drop a file on the page and see the trace, the event table and the loss figures a few seconds later, on Windows, Mac, Linux or a phone. It reads standard .sor files and the native formats of EXFO, VIAVI, Anritsu, Fluke, Yokogawa and other makers, so one tool covers files from different instruments. You can also drop a .zip, .7z or .rar with a whole cable inside and it opens without unpacking. The interface is available in 15 languages.
Most trace viewers are Windows desktop programs made by an instrument vendor for that vendor's own files. OTDR Master needs no installation and is not tied to one brand. The free plan is enough for real work on a single fiber: view and edit the trace, compare up to eight traces on one plot, average a bidirectional pair, check a PON link, save the result as .sor, print a PDF report, and send a colleague a link instead of a file. The paid plan adds what you need for whole cables: summary reports, batch edits, projects, your own report template and Excel export.
Fiber technicians, splicers and contractors who measure links with an OTDR and then have to show the result to someone else. That includes engineers who receive trace files from the field and need to read them without the vendor's software, and people who got a .sor file by email and have nothing to open it with. Most of them work with batches of files, one per fiber, and their real task is handing a finished report to the customer.
The parsing and analysis core is written in Rust and runs on the server. The web client is React and TypeScript.
We started in 2026 with a simple problem: someone sends you a trace file and you can't open it, because the viewer runs only on Windows or only reads files from one brand of instrument. We built a reader that works from a link and kept adding formats as people brought files it could not open yet. Reports came next, because people open this kind of software to hand a document to the customer, and the file is only the raw material. Work with whole cables and projects followed, and that became the paid plan.
We have collected here some useful links to help you find out if OTDR Master is good.
Check the traffic stats of OTDR Master on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Check the "Domain Rating" of OTDR Master on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of OTDR Master's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Check the "Domain Authority" of OTDR Master on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
The latest comments about OTDR Master on Reddit. This can help you find out how popualr the product is and what people think about it.
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Is OTDR Master good? This is an informative page that will help you find out. Moreover, you can review and discuss OTDR Master here. The primary details have been verified within the last quarter. So they could be considered up to date. If you think we are missing something, please use the means on this page to comment or suggest changes. All reviews and comments are highly encouranged and appreciated as they help everyone in the community to make an informed choice. Please always be kind and objective when evaluating a product and sharing your opinion.
