File Viewer

No. Folder reading, thumbnails, and display all happen inside your browser; photos never leave your device.

Safari, Firefox, and mobile browsers don't support the folder-open dialog, so the standard folder picker is used. Chrome and Edge show the dedicated dialog.

Yes. They are converted to JPEG when displayed. The first display is a little slower, so convert folders you view often with the HEIC Converter.

No. The viewer is read-only. It never asks for write access to the folder, so nothing can be deleted by accident.

Up to 5,000 per folder. For more, open subfolders separately. Thumbnails are made only for what's visible, so hundreds stay light.

No. Only the view rotates. To rotate and save the file itself, use the Image Editor.

The viewer shows the JPEG preview the camera embeds, which is often below full resolution. It's plenty for culling; developing needs a dedicated program.

All of them. Page with ↑↓ or the ▲▼ buttons in the toolbar; ← → move to the next file. The grid badge shows the page count. HWP works the same way.

This is view-only (macro-enabled DOCM/PPTM/XLTM, templates DOTX/POTX/XLTX, and PPSX slideshows open the same way). Click 'Open in document viewer' in the toolbar and the file is handed to the document viewer for editing, printing, and saving as PDF.

Yes. Containers the browser can't open are prepared on your device when opened — video (MKV, AVI, WMV, TS, FLV, RM/RMVB, DivX, MPE, OGM) is first remuxed (a few seconds) and, if the codec isn't supported, converted with a progress indicator. Audio (WMA, AIFF, AMR, AC3, APE, MKA, M4B, WV, TTA, MPC) is converted to MP3. Files over 900 MB should be converted first with the Video Converter tool.

DWG (AutoCAD 2000 and later) and DXF are shown as pictures. Pre-2000 DWG and damaged files won't open. To hide layers or change dates, use Open in dedicated viewer to hand the file to the CAD viewer.

Yes. In single-file view, click 🖨 or press Ctrl/Cmd+P to send the current file to the print dialog. Photos and drawings fit one page (as rotated on screen), PDF and HWP print every page, and Word, Excel, text, subtitles, ZIP listings, and font samples print as shown. Drawings print as black lines on white, and video and audio can't be printed. You can also choose Save as PDF in the dialog.

Yes. Use the Add files button in the grid or the single-file view, or drop files or folders onto the page; they are appended to the current list. Files already in the list are skipped, and in single-file view the viewer jumps to the first added file. To switch folders entirely, use Open another folder.

Yes. STL (binary and ASCII) for 3D printing and OBJ (vertices and faces) are drawn with browser 3D (WebGL): drag to rotate, wheel to zoom. Colors, materials, and textures aren't read — the model is shaded in one color. Up to 2 million triangles; GLB and GLTF aren't supported yet.

Yes. Open a .dcm file to view X-ray, CT, or MR images with window/level sliders (CT has soft-tissue, lung, bone, and brain presets) and page through multi-frame files with ▲▼. Patient name and ID are never shown. Uncompressed and baseline-JPEG files display; JPEG Lossless, JPEG 2000, and RLE need codecs the browser doesn't have. Files without an extension aren't recognized by name.

Only the body text is extracted (a Text-only badge is shown). Tables, images, and fonts can't be rendered because there is no browser renderer for these formats, and password-protected .doc files won't open. Legacy PowerPoint (.ppt) isn't supported.

Open signCert.der from a Korean NPKI certificate folder to check its expiry at a glance. The subject (CN, organization), issuer, validity period and whether it has expired, SAN domains, public key type (RSA bits or EC curve), signature algorithm, serial number, and SHA-256 fingerprint. Chain PEMs with several certificates are read in full, and DER (.cer) works too. Private key files never show the key value — only a private-key warning — and a CSR only gets a signing-request notice. PFX/P12 isn't supported yet.

Yes. Markdown cells render as formatted text, code cells show with their execution numbers, and saved outputs appear as text, images, tables (in an isolated frame), or errors (red box). Code is never executed.

Yes. Email shows subject, from, to, date, the body (HTML in an isolated frame with scripts and remote images blocked), and the attachment list; Expand attachments adds the viewable ones to the list. Outlook .msg works the same. Calendar (.ics) files show events in start order. Nothing is sent to a server.

The viewer shows the preview image stored inside the file (first page or slide). There is no renderer for the body, so a Preview badge is shown and the original app is needed to read or edit the content. Numbers opens as a table.

Yes (a TTC collection shows its first font). The grid shows an 'Aa 가나' thumbnail set in the font, and opening it shows the name, version, glyph count, and Korean support along with sample lines at 72, 40, 24, and 16 px. Type your own text to see it in the font. The font is registered only for this screen and never installed.

SRT, VTT, SMI, and ASS subtitles show as a table of times and lines, and legacy EUC-KR SMI decodes correctly. EPUB e-books show their cover in the grid and open with a table of contents and chapter text (images and styles included), rendered in a script-blocked frame.

ZIP, TAR, TGZ (tar.gz), and ZIP-based APK, JAR, IPA, XPI, and WAR files are listed (name, size, date) without extracting. A CBZ comic opens straight into its pages in reading order. Expand and view appends the viewable files to the list under an 'archive.zip/…' folder, and each file is extracted only when you look at it, so multi-hundred-megabyte archives stay light. Korean file names from Windows-made archives decode correctly; password-protected files show in the list only.

Yes. TXT, LOG, MD, CSV, TSV, JSON, HTML, XML, and common source-code extensions open in place. Markdown renders as a formatted document, CSV as a table, and HTML runs in a frame isolated from the site with its scripts enabled (so password-protected HTML such as Korean Hometax tax-invoice secure mail unlocks right there). Legacy EUC-KR notes decode correctly.

Yes. MP3, WAV, M4A (AAC), OGG, and FLAC play in the browser's player, and the viewer moves to the next file when a track ends. Space plays or pauses. Formats browsers can't open, such as WMA, don't appear in the list; convert them with the Audio Converter.