Practical guides for opening, inspecting, troubleshooting, and understanding supported file formats.
A PAK file is a game archive, but there is no universal PAK format. Here is how to identify which game your PAK came from and open it with the right tool.
CR2 is Canon's RAW photo format - unprocessed sensor data from a Canon DSLR. Here is what CR2 files are, how they differ from CR3, and how to convert them to JPG.
DNG is Adobe's open RAW photo format - a universal digital negative. Here is what DNG files are, how they compare to CR2 and NEF, and when you need Adobe's converter.
Excel freezing, truncating, or refusing to open a large CSV file? Learn why it happens and how to inspect, search, filter, and export large CSV data without loading everything into a worksheet.
A PAK file is a game archive, but there is no universal PAK format. Here is how to identify which game your PAK came from and open it with the right tool.
CR2 is Canon's RAW photo format - unprocessed sensor data from a Canon DSLR. Here is what CR2 files are, how they differ from CR3, and how to convert them to JPG.
DNG is Adobe's open RAW photo format - a universal digital negative. Here is what DNG files are, how they compare to CR2 and NEF, and when you need Adobe's converter.
A FITS file is the standard image format used in astronomy - high-precision image data plus a header describing the observation. Here is what FITS files are and how to open them.
GGUF is the file format for quantised local LLM weights used by llama.cpp, Ollama and LM Studio. Here is what GGUF is, how it differs from safetensors, and how to pick a quantisation.
A PSB file is Photoshop's Large Document format, built for files beyond PSD's 30,000-pixel and 2GB limits. Here is what PSB files are and how to open one without Photoshop.
A THM file is a small JPEG thumbnail your camera saves next to videos. Deleting it is safe. Here is what THM files are, why GoPro creates them, and how to view them.
An AAE file is a small XML file your iPhone creates to store photo edits. Deleting it is safe, but the photo reverts to its unedited original. Here is what to know.
Excel freezing, truncating, or refusing to open a large CSV file? Learn why it happens and how to inspect, search, filter, and export large CSV data without loading everything into a worksheet.
HEIC photos from an iPhone won't open on Windows 11? Learn why it happens, what the codec errors mean, and how to view, convert, or inspect HEIC files without installing anything.
Downloaded a Google Takeout MBOX file and can't open it? Learn what an MBOX archive is, why mail clients struggle with it, and how to read, search, and export your Gmail messages on Windows or Mac.
Downloaded a GPX track and want to check it before sending it to your Garmin? Learn how to open, preview, and verify GPX files on iPhone or Android without installing a desktop app.
Need to read a Microsoft Access .mdb or .accdb database but don't have Access installed? Learn the difference between the formats and how to view tables, queries, and records in your browser on Windows or Mac.
Can't open an Outlook .msg file without Microsoft Outlook? Learn why it happens and how to read MSG email contents, attachments, and headers in your browser on Windows or Mac.
Parquet files are everywhere in data engineering, but you don't need Python, pandas, or Jupyter to read them. Learn how to view, query, and export Parquet data in your browser without installing a data science stack.
HAR files capture every request your browser makes - including cookies, tokens, and passwords. Learn how to inspect and sanitize a HAR file before sharing it with support, so you don't leak sensitive data.
GitHub showing a blank or broken Jupyter Notebook? Learn why IPYNB files fail to render on GitHub and how to view notebook cells, code, and outputs in your browser without installing Jupyter.
Google Earth refusing to open your KML or KMZ file? Learn why it happens, what the errors mean, and how to preview, validate, and fix KML and KMZ files without installing anything.
Browse FileViewerHub viewers for supported file formats.
Browse All Viewers
