Tulbo
free tools · in your browserEveryday tools, no install, one place.
Edit, compress and convert photos, merge/split/replace PDF pages, plus handy generators — ready the moment you open it.
Files never leave your device, so use it with peace of mind.
Photo Studio
Crop, filters, text, mosaic, background removal and convert — in one screen
PBatch image compressor
Shrink many images at once — see savings before you save
Color picker from image
Click any spot to copy its HEX code instantly
Background remover
One click to a transparent PNG — then compose onto a new background
PImage resizer
Resize precisely by pixels or percent — format and quality included
Image to GIF Maker
Turn photos into an animated GIF — speed, loop, boomerang
ID / Passport Photo Maker
Crop to 35×45 mm, 2×2 in and more, saved at 300 DPI — on your device only
Privacy masking
Hide IDs and phone numbers with one drag — images and PDFs, safely
Merge PDF
Combine multiple PDFs into one, in order
Split / Extract PDF
Pick only the pages you need into a new PDF
Replace / insert PDF pages
Swap a page in the middle, or slot new pages in anywhere
Images → PDF
Bundle multiple photos into one PDF
Stamp / sign a PDF
Place a stamp or signature image anywhere and save
PDF → images
Save each page as a JPG or PNG image
Compress PDF
Slim down scan-heavy PDFs — preview the result before saving
MP3 Cutter (Ringtone)
Cut any part of a song to MP3 or WAV with fades — no upload
Image to text (OCR)
Pull text out of photos and scans — processed on your device
Text & document compare (Diff)
Paste text or drop PDF, Word and Excel files — changes highlighted line by line and character by character
Data converter (Excel·CSV·JSON)
Excel ↔ JSON, CSV and Markdown tables — just paste and convert
Character counter
With/without spaces, words, lines and bytes — live
Batch file renamer
Turn hundreds of files into name_01, name_02… in one go
Wheel & picker
Spin a wheel or draw random winners — lunch picks to giveaways
QR code generator
Turn links or text into a QR image
Barcode generator
Create CODE128 / EAN-13 barcodes as images
Date calculator · D-Day
Days between dates, or the date N days away — instantly
Password generator
Strong random passwords with your rules
Photo Studio
Crop, filters, text, mosaic, background removal and convert — in one screen
How to use
- Drop a photo in, or paste it with Ctrl+V.
- Move between Crop, Adjust, Text, Draw and Background tabs to edit.
- Drag the orange corner handle on a text to resize and rotate it at once.
- For mosaic or blur, drag a rectangle — it applies the moment you release.
- In the Export tab, pick a format (PNG·JPG·WebP) or a target size and save.
Tips
- Made a mistake? Ctrl+Z or the Undo button steps back up to 4 times.
- Use the eyedropper (💧) to pick any color from the photo for pen or text.
- Background removal downloads its model (~40MB) once on first use.
Are my photos uploaded to a server?
No. All editing happens inside your browser on your device; files are never transmitted anywhere.
Which formats can I convert to?
PNG, JPG and WebP are supported, plus AVIF where your browser supports it. Auto compression to a target size (KB) is also available.
Merge PDF
Combine multiple PDFs into one, in order
How to use
- Drop several PDF files in at once.
- File mode: reorder the cards on the left — the preview follows.
- Switch to page mode to arrange every page by drag or ←→, and remove with ×.
- When the order looks right, hit Merge & download.
Tips
- Thumbnails show up to the first 60 pages per file, but merging always uses every page.
- Above 400 total pages, only file-level merging is offered for performance.
- Each file gets a color badge so you can tell pages apart at a glance.
How many files can I merge?
There is no fixed limit; speed depends on your device and file sizes.
Is it safe?
PDFs are processed only in browser memory and never sent to a server. Closing the tab clears everything.
Split / Extract PDF
Pick only the pages you need into a new PDF
How to use
- Upload a PDF — every page appears as a thumbnail.
- Click the pages you want to keep (Select all / none helps).
- Hit Extract to save them as a new PDF.
Tips
- What you select is exactly what you get — the thumbnails are the preview.
- Need a long range? Select all, then click off the few you do not need.
Can I pick specific pages?
Yes. Click page previews to select exactly the pages you want, then extract them into a new PDF.
Replace / insert PDF pages
Swap a page in the middle, or slot new pages in anywhere
How to use
- Upload the original PDF and click the anchor page.
- Choose an action: Replace, Insert before or Insert after.
- Take pages from another PDF (multiple allowed) or add an image — Ctrl+V works for screenshots.
- Apply, keep editing other pages, then download once at the end.
Tips
- Replace can be one-to-many: remove one page and insert several.
- Inserted images are sized to match the anchor page automatically.
What can I use as the replacement?
A specific page from another PDF, or an image (scan/photo). Images are fitted to the original page size.
Can I replace multiple pages?
Yes. After one replacement, select another page and repeat, then download once at the end.
Images → PDF
Bundle multiple photos into one PDF
How to use
- Add several photos (Ctrl+V paste works too).
- Drag thumbnails or use ←→ to set the order.
- Pick page size (A4 portrait/landscape/original), placement (fit/fill), vertical position and margin color — thumbnails preview the real layout.
- Hit Create PDF to save.
Tips
- For portrait photos, A4 portrait + Fit is the safe default.
- A custom margin color gives an album or portfolio feel.
QR code generator
Turn links or text into a QR image
How to use
- Type a link or any text.
- Change the colors (code·background) and optionally add a center logo.
- Generate, then Save PNG.
Tips
- With a logo, the QR uses maximum error correction (H) — still, always do a real scan test before printing.
- Low contrast (light code on light background) can hurt scanability.
Batch image compressor
Shrink many images at once — see savings before you save
How to use
- Drop in many images at once (Ctrl+V works too).
- Thumbnails appear on the left, per-file estimated savings on the right.
- Tune format, quality, max width — or set a per-image target size and hit Auto-fit.
- Compress & download as a ZIP.
Tips
- At equal quality, WebP is usually smaller than JPG.
- PNG is lossless, so the quality slider does not apply — switch to JPG/WebP to shrink.
Will quality suffer?
You control quality with a slider and see per-file savings before saving. WebP is usually smaller than JPG at the same quality.
Color picker from image
Click any spot to copy its HEX code instantly
How to use
- Upload an image (Ctrl+V works) — dominant colors are extracted automatically.
- Click anywhere on the photo to copy that pixel’s HEX code instantly.
- A magnifier loupe follows your cursor for pixel-perfect picks.
- Zoom with − / + / Fit for fine details.
Tips
- Picked colors stack above the photo so you can compare them like a palette.
Character counter
With/without spaces, words, lines and bytes — live
How to use
- Paste your text — characters (with/without spaces), words, lines and bytes update live.
Tips
- Handy for essay limits and social media character caps.
Password generator
Strong random passwords with your rules
How to use
- Pick a length and character types (upper, lower, digits, symbols).
- Generate, then Copy to use it right away.
Tips
- 16+ characters with symbols is a realistic safety bar.
- Generation uses your browser’s crypto randomness and is never stored or sent anywhere.
Video Studio
Compress, resize, trim, convert and make GIFs — right in your browser, no upload
Why does conversion take as long as the video?
Without a server, your browser literally plays the video and re-records it. A 3-minute video takes about 3 minutes — and the file never leaves your device. A faster engine is on the roadmap.
MP4 is disabled for me
MP4 output is enabled only when your browser supports it (recent Chrome, Safari…). Otherwise we save WebM, which plays in most players and on the web.
Batch file renamer
Turn hundreds of files into name_01, name_02… in one go
How to use
- Drop your files in — any type works.
- Set a base name, start number and digits — the result names preview instantly.
- Choose sorting (name, date, manual) — manual lets you drag the order, with image thumbnails.
- Download everything as a ZIP.
Tips
- For trip photos where order matters, manual sort with thumbnails is the safest.
Barcode generator
Create CODE128 / EAN-13 barcodes as images
How to use
- Enter a value and pick a format (CODE128 or EAN-13).
- The preview renders instantly — Save PNG to download.
Tips
- EAN-13 needs 12–13 digits; for free text use CODE128.
Date calculator · D-Day
Days between dates, or the date N days away — instantly
How to use
- Between two dates: pick both dates to get the gap in days and weeks.
- Add / subtract: enter a base date and days to get the resulting date (negative = past).
Tips
- Great for countdowns, contract deadlines and anniversaries.
Stamp / sign a PDF
Place a stamp or signature image anywhere and save
How to use
- Upload a PDF — the settings panel opens right away.
- Add a stamp/signature image (Ctrl+V works) or draw one with ✍️.
- Click the target page, then drag the stamp into place on the preview.
- Adjust size and opacity, Apply — repeat on other pages, then download.
Tips
- Hand-drawn signatures become transparent PNGs that sit naturally on the page.
- Slightly lowering opacity gives a realistic ink look.
PDF → images
Save each page as a JPG or PNG image
How to use
- Upload a PDF and select the pages to convert.
- Choose format (PNG·JPG) and resolution.
- Save — multiple pages come down as a ZIP.
Tips
- Go higher resolution for print or zooming; JPG is lighter for sharing.
Compress PDF
Slim down scan-heavy PDFs — preview the result before saving
How to use
- Upload a PDF and choose quality and resolution.
- Hit Compress — you get a preview and the size change.
- Check the savings, then download if you like the result.
Tips
- Works best on scan/photo-heavy PDFs — text-only PDFs are often already efficient.
- After compression, pages become images, so text is no longer selectable (as noted on screen).
Privacy masking
Hide IDs and phone numbers with one drag — images and PDFs, safely
How to use
- Upload an image or PDF — screenshots paste right in with Ctrl+V.
- Images: pick a style (black box, mosaic, blur) and drag over the area — it applies on release.
- PDFs: click the page, drag over the area, then hit Redact selection.
- When everything is covered, save or download.
Tips
- A black box alone leaves PDF text copyable underneath — this tool flattens the page to an image so the data is truly gone.
- Mistakes? Undo (last 5) or Restore original.
- Everything stays on your device — safe even for IDs and contracts.
Is the data under the box really gone?
Yes. Images have their pixels destroyed, and PDF pages are re-rendered as images so the original text data is removed. It can’t be recovered by copying or moving objects.
Text & document compare (Diff)
Paste text or drop PDF, Word and Excel files — changes highlighted line by line and character by character
How to use
- Paste text into Base (left) and Revised (right), or drop files — PDF, Word (.docx), Excel and TXT are supported.
- Hit Compare to get a change list plus side-by-side highlights.
- Click any change in the list to jump both panes to that exact spot.
Tips
- PDFs show locations as page numbers (p.3); plain text uses line numbers.
- Scanned-image PDFs have no extractable text to compare (OCR is coming).
- You can edit the extracted text before comparing.
Which files can I compare?
PDF, Word (.docx), Excel (.xlsx/.csv) and plain text. Text is extracted for comparison, so formatting and images are ignored, and scanned image PDFs have no text to compare (OCR coming). Save legacy .doc/.hwp as .docx first.
Data converter (Excel·CSV·JSON)
Excel ↔ JSON, CSV and Markdown tables — just paste and convert
How to use
- Drop an Excel/CSV file, or just paste below — Excel tables, CSV and JSON are auto-detected.
- Pick a sheet if there are several.
- Choose an output (JSON, JSON 2D, CSV, Markdown) — conversion is instant.
- Copy it, or save as .xlsx.
Tips
- Copying a range straight out of Excel and pasting here is the fastest workflow.
- Markdown tables paste straight into GitHub or Notion.
Image resizer
Resize precisely by pixels or percent — format and quality included
How to use
- Upload an image — a preview and its original size appear.
- Type width/height in pixels (ratio stays linked) or tap 100·75·50·25%.
- Pick format and quality — the estimated size updates live.
- Save to download.
Tips
- The quality slider appears only for JPG and WebP.
- The new dimensions are appended to the filename automatically.
Image to text (OCR)
Pull text out of photos and scans — processed on your device
A server vision model for Korean, tables and handwriting — preview free, document download for 1 token. Only this feature sends your file to a server, deleted right after processing.
How to use
- Upload an image or paste it with Ctrl+V — screenshots work instantly.
- Pick a recognition language (Korean+English / English).
- Hit Extract text — the result appears on the right with a progress readout.
- Tidy up the result, then Copy it or Save as .txt.
Tips
- The recognition model (a few MB per language) downloads once — cached and fast afterwards.
- Printed text in sharp photos works best. Korean and handwriting accuracy is limited — high-accuracy OCR is coming.
- All recognition happens on your device.
Wheel & picker
Spin a wheel or draw random winners — lunch picks to giveaways
How to use
- Type an item and press Enter or Add — each becomes a chip. Paste multiple lines to add them all at once (duplicates removed, up to 60).
- Wheel mode: hit Spin! — the wheel turns and the pointer picks the winner.
- Draw mode: set how many winners, then hit Draw now for a random pick.
- Turn on Remove picked items so repeat draws never pick the same one twice.
Tips
- Hit the × on a chip to remove just that item.
- Perfect for lunch choices, presentation order, giveaways and chore duty.
- Draws use your browser randomness and are never stored or sent anywhere.
Image to GIF Maker
Turn photos into an animated GIF — speed, loop, boomerang
How to use
- Drag several photos in, or paste them with Ctrl+V.
- Drag thumbnails to set the order — the number is the play order.
- Pick speed, output size and loop, and turn on boomerang if you like.
- Use Build preview to check, then Save GIF to download a .gif.
Tips
- Photos of different sizes are matched to the first frame — choose Fit (padding) or Fill (crop).
- Boomerang plays forward then back for a smooth loop.
- Photo-heavy frames may band. With many frames, lower the output width to keep the file small.
Ladder Game (Amidakuji)
Type names, ride the ladder — pick who pays or who does what
How to use
- Tap a name badge to ride down — the result card below flips open (default: 1 win, rest miss).
- Set players (2–12) with −/+, and use Winning slots + Auto-place to set up the game.
- To type names or results, use Edit — Enter jumps to the next box; bulk paste (commas/line breaks) and Shuffle are there too.
- Reveal all shows every result; Rebuild ladder redraws rungs and covers the cards again.
Tips
- Rungs are fixed before you tap — no manipulation.
- Result cards stay hidden as “?” until opened, keeping the suspense.
- Empty names show as numbers; empty results as “Miss”.
Percentage Calculator
X% of Y, ratios, percent change, increase & decrease — instantly
How to use
- Pick the row you need and just type numbers — results appear instantly.
- ① X% of a total ② A is what % of B ③ percent change (before→after) ④ value after % increase/decrease.
- For ④, choose direction with the Increase/Decrease buttons.
- Commas (1,000) are accepted.
Tips
- Division by zero (total 0, or before 0) shows "—".
- Percent change is signed: + means increase, − means decrease.
- Decimals are rounded to 6 places and trailing zeros trimmed.
Area Converter (pyeong ↔ m²)
Pyeong ↔ square meters and m² ↔ ft², both ways, instantly
How to use
- Type pyeong to get square meters, or type m² to get pyeong — both ways.
- The second row converts m² ↔ ft².
- Clearing one side clears the other.
Tips
- 1 pyeong = 400/121 m² (exact fraction) ≈ 3.3058 m² — shown rounded to 4 decimals.
- Common Korean flat sizes: 84 m² ≈ 25.41 pyeong, 59 m² ≈ 17.85 pyeong.
- Commas (1,000) are accepted.
ID / Passport Photo Maker
Crop to 35×45 mm, 2×2 in and more, saved at 300 DPI — on your device only
How to use
- Upload or paste one photo (Ctrl+V).
- Pick a size — passport/visa 35×45 (default), 30×40, 25×30, or US 2×2 in.
- Drag to position and use the slider to resize. The face guides (oval, eye line) are for reference and are not saved.
- Press Save JPG or Save PNG to download at exact 300 DPI pixels.
Tips
- Solid backgrounds (white/blue/gray) only fill transparent PNGs — remove the background first with the Background Remover tool.
- JPG has no transparency, so “Keep original” saves on white.
- Always confirm exact size, dress and expression rules with the issuing authority.
MP3 Cutter (Ringtone)
Cut any part of a song to MP3 or WAV with fades — no upload
How to use
- Upload an audio file (MP3, WAV, ...) and the waveform appears.
- Set the cut range with the Start/End sliders — orange lines mark the edges.
- Check with Play selection, and enable fade in/out (1s each) if you like.
- Download with Save MP3 (128/192/320 kbps) or lossless Save WAV.
Tips
- Ringtones are usually 20–40s — start just before the chorus and enable fade out.
- iPhone ringtones need the m4r format separately (this tool covers MP3/WAV).
- DRM files and browser-unsupported formats cannot be opened. MP3 encoding uses lamejs (LGPL).