Drop a file here or click to select
Select a local media file to preview and generate subtitles.
Drop an SRT or VTT file here or click to select
Import SRT or VTT. All cues are kept.
Auto-detect is the default. Select a language if detection is inaccurate.
Standard is faster and uses less memory. Enhanced may improve recognition but needs a larger download, more memory and more time.
Leave the end blank to process to the end. Regenerating a range replaces overlapping cues and keeps the others.
Recognition resources download on first use, then reuse the browser cache when available.
Generate subtitles from speech in your local media file. Once complete, captions follow playback.
The project saves edits, subtitles and settings locally, without the media. Reselect the same original file to restore; its complete contents are checked.
Media files are processed in your browser and are not uploaded to a server.
Generate subtitles from local video or audio, or import SRT/VTT to edit text and timing with synchronized playback. Download a separate subtitle file, or burn subtitles into a new MP4 when a video is loaded.
Timing validation reports invalid ranges, cues that are out of order, and overlaps. Overlaps are warnings because they can be intentional.
Yes. Select a local video and click Generate subtitles. Language and recognition mode are under Settings. Wait for recognition to finish, then review the text and timing.
Click a cue to seek to its start. Edit its times, use the current video position as a boundary, shift all cues, or use two-point calibration for gradual timing drift.
SRT/VTT downloads contain only subtitle text and timing. Export subtitled video creates a new MP4 with subtitles permanently included in the picture, so they cannot be turned off. Both options leave the original media file unchanged.
Your existing subtitles stay available. Only a successful new result replaces them. Selecting another video or importing a subtitle file cancels the pending generation.
Undo and Redo cover text, timing and cue operations. Subtitle text and timestamps are saved on this device. After reloading, restore the draft and select the media file again for preview.
Under Edit tools, place the text cursor at the split point and choose Split cue. Merge with next joins the selected and next cues. Find and replace updates matching text across all cues.
Use Video Subtitle Track Manager to add SRT/VTT as a separate subtitle track. Compatible players can turn that track on or off. The subtitled MP4 exported here uses burned-in subtitles.
Yes. Open “Edit media by transcript”, select sentences or continuous groups, and join the kept ranges as MP4 for video or MP3/WAV for audio. You can reorder groups and add padding; the panel explains how overlaps are handled. Synchronized SRT/VTT captions include every caption intersecting a kept range and use the joined timeline. Changing transcript wording alone changes the subtitles. The original media file stays unchanged.
Format and beautify Java, Python, JavaScript, JSON, HTML and more; adjust indentation, spacing and line breaks.
Trim, join or split recordings, remove silence or noise, and adjust volume, speed, pitch or channels.
Open and edit CSV or Excel sheets, format tabular text, and convert CSV to Excel or SQL.
Write and preview Markdown, render Mermaid diagrams, and convert Markdown, HTML and tables between formats.
Compare passages, count words and keywords, sort or replace lines, and view DOCX text.
Look up Chinese meanings, synonyms and antonyms, or find IPA pronunciations in multiple languages.
Convert between MP3, WAV, FLAC and more, play audio or raw PCM, and inspect or edit audio metadata.
Inspect, compare and validate JSON; test JSONPath expressions, or convert data to CSV, YAML and XML.
Transcribe audio to text, generate speech from text, or record your voice in the browser.
Convert and compress video, trim or join clips, resize frames, and extract audio.
Play local or streaming video, record your screen or camera, and use your camera as an online mirror.
Compress or merge PDFs, split and rearrange pages, convert pages to images, and view or compare documents.
Convert image formats, resize or crop photos, compress files, compare pictures, and extract text with OCR.
Capture and beautify screenshots, turn text into images or GIFs, draw on a whiteboard, and create word clouds or favicons.
Edit SRT or VTT captions with a video preview, shift timing, convert formats, and manage subtitle tracks.
Open ZIP, 7Z, RAR or TAR files, extract selected contents, and create new archives with optional ZIP/7Z passwords.
Encode and decode Base64 or Base32, escape URLs, HTML and Unicode text, and inspect JWT contents.
Convert number bases and values between binary, decimal and hex; turn numbers into words or text into binary.
Work out percentages and fractions, summarize statistics, and calculate grades, discounts or aspect ratios.
Show an online clock, run a countdown or stopwatch, and calculate dates, ages or time-zone differences.
Check your IP and IPv6 connection, inspect HTTP requests or HAR files, and calculate CIDR address ranges.
Convert length, weight, temperature, data storage and other units.
Convert HEX, RGB and HSL values, extract colors from an image, check contrast, or test your display with solid colors.
Generate and scan QR codes or barcodes, including QR codes for links and Wi-Fi networks.
Generate hashes, UUIDs and passwords, test regular expressions, create URL slugs and check file permissions.
Check screen resolution and refresh rate, measure with a screen ruler, test keys, or read from a teleprompter.
2048, Minesweeper, Sudoku, Gomoku, Tank Battle