Frequently asked questions

Quick answers about every ToolyDay tool. Your files are always processed in your browser and never uploaded.

PDF Tools

Merge PDF

Are my PDF files uploaded when I merge them?: No. The files are combined on your own device, in your browser. Nothing is sent to a server, and you can check this yourself on the Verify page.
Can I change the order of the files before merging?: Yes. Use the ↑ and ↓ buttons next to each file to move it, then click "Merge". The merged PDF follows the order shown in the list.
Is there a limit on how many PDFs I can merge?: There is no fixed limit and no watermark. The practical limit is your device's memory, so very large files or very long lists may be slow on a phone.

Split PDF

What do I get after splitting a PDF?: A ZIP file that contains one PDF for every page of the original. Your original file is not changed.
Can I keep only some pages instead of every page?: Yes. Use the "Extract PDF Pages" tool to keep just the pages you choose as one new PDF, or "Delete PDF Pages" to remove the ones you do not want.
Is it safe to split a confidential PDF here?: Yes. The file is processed locally in your browser and is never uploaded, so nobody else can see it.

Extract PDF Pages

How do I choose which pages to keep?: Type page numbers and ranges separated by commas, for example 1-3, 5, 8-10. A range such as "8-" means page 8 to the end.
Is my original PDF changed?: No. The chosen pages are copied into a new file and your original stays as it was.
Are bookmarks and form fields kept?: No. Pages are copied into a new file, so bookmarks and form fields are not kept.

Delete PDF Pages

How do I choose which pages to delete?: Type page numbers and ranges separated by commas, for example 2, 4-6. A range such as "7-" means page 7 to the end.
Are the deleted pages really gone from the file?: Yes. The deleted pages are removed completely from the new file, so nobody can recover them from it. This makes the tool a good choice for removing confidential pages before sharing a PDF.
Are bookmarks and form fields kept?: No. Bookmarks and form fields are not kept in the new file.

Rotate PDF

Can I rotate only some pages?: No. This tool rotates every page by the same angle.
Which angles can I choose?: 90°, 180° or 270°.
Is my file uploaded to rotate it?: No. The rotation happens on your device in your browser, and the file never leaves it.

Compress PDF

How much smaller will my PDF get?: It depends on the file. PDFs that are mostly photos or scans can shrink a lot. PDFs that are mostly text usually shrink very little, because there are few images to compress.
Does compressing reduce the quality of my PDF?: The images are recompressed, so a stronger level can make them look softer. The text is left intact. Start with a medium level and check the result before using it.
Is my PDF uploaded to compress it?: No. The compression runs on your device in your browser. Your file never leaves it.

OCR – Extract Text

Which languages can it recognize?: English, Vietnamese, Spanish, Portuguese, Indonesian, French, German, Japanese and Korean. Pick the language of your document for the best result.
Why is the first run slow?: The language data is loaded the first time you use a language, so the first run takes longer.
How accurate is the result, and is there a page limit?: Accuracy depends on scan quality: sharp, straight, well-lit scans work best, so always check the text. Up to 20 pages are read per run; for a longer file, enter a page range such as 1-20, then 21-40.

Image to PDF

Which image formats can I use?: JPG and PNG. If you have another format, convert it first with the "Convert Image" tool.
Can I change the order of the pages?: Yes. Reorder the images in the list before you click "Create PDF". The PDF follows that order, with one image per page.
Are my photos uploaded?: No. The PDF is created on your device, in your browser.

Word to PDF

Does it support old .doc files?: No, only .docx files. If you have an older .doc file, open it in Word or another editor and save it as .docx first.
Will the PDF match my Word document exactly?: The content and structure are kept, but fonts, colors and complex layouts can differ from the original. Check the PDF before you send it.
Is my Word document uploaded?: No. It is converted on your device in your browser and never leaves it.

Excel to PDF

Does it support old .xls files?: No, only .xlsx files. Open an older .xls file in Excel or another spreadsheet app and save it as .xlsx first.
Are charts and cell colors kept?: No. Cell data is kept, but charts, colors and cell formatting are not.
Is my spreadsheet uploaded?: No. It is converted on your device in your browser and never leaves it.

PowerPoint to PDF

Does it support old .ppt files?: No, only .pptx files. Open an older .ppt file in PowerPoint and save it as .pptx first.
Will my slides look exactly the same?: Text, images and filled boxes are kept. Charts, effects and complex themes are not, so check the PDF before you share it.
Is my presentation uploaded?: No. It is converted on your device in your browser.

HTML to PDF

Will the PDF look like the web page?: No. The result keeps the content, not the page design. Scripts, CSS and images from the web are ignored.
Why are scripts and styles ignored?: For safety, the HTML is never run. The tool reads only the content it knows, so a file cannot execute code on your device.
Is my HTML file uploaded?: No. It is converted on your device in your browser.

PDF to Image

Should I choose PNG or JPG?: PNG is sharper and best for text and diagrams. JPG makes smaller files and suits photos.
What do I get after converting?: A ZIP file with one image for every page of the PDF.
Is my PDF uploaded?: No. The pages are converted on your device in your browser.

PDF to Word

Will the Word file look exactly like my PDF?: Text and font sizes are kept, but complex layouts and images on pages that contain text are not reproduced exactly. Expect to tidy the formatting afterwards.
What happens to scanned PDFs?: By default, scanned pages are read with OCR and become editable text in the Word file, up to 20 scanned pages per run (use the Pages box for the next part). You can also choose to keep them as pictures. Check the text, because OCR can make mistakes.
Is it safe to convert a private PDF?: Yes. The conversion happens locally in your browser, and the PDF is never sent to any server.

PDF to Excel

Which PDFs work best?: Simple tables with clear columns. Columns are detected from the position of the text, so check the result, especially for complex layouts.
Does it work on scanned PDFs?: No. Scanned PDFs are not supported because they contain pictures, not text. Run them through "OCR PDF" first to get the text.
Is my PDF uploaded?: No. The conversion happens locally in your browser.

PDF to PowerPoint

Can I edit the text in the slides?: Not directly. Each page is inserted as a picture, so it looks like the original but the text cannot be edited. To get editable text, use "PDF to Word".
How many slides do I get?: One slide for every page of the PDF.
Is my PDF uploaded?: No. The conversion happens locally in your browser.

Protect PDF with Password

What happens if I forget the password?: The file cannot be opened and we cannot recover it. The password never leaves your browser, so we do not have it. Keep it somewhere safe.
What kind of encryption is used?: AES-256, a strong standard used to protect sensitive documents.
Is my original file changed?: No. You get a new, protected copy to download, and your original stays as it was.

Edit PDF

Can I change the existing text in the PDF?: No. You add things on top of the page, and the original text cannot be changed.
Does "Cover" remove content from the PDF?: No. Content hidden with "Cover" is only hidden and stays in the file. To remove content completely, use "Delete PDF Pages".
Is my PDF uploaded to edit it?: No. The editor runs on your device in your browser, and the file never leaves it.

Write on PDF

How do I add text to a PDF?: Click on the page where you want the text and type. You can also choose "Draw" to write by hand. Then click "Save PDF".
Can I change the text that is already in the PDF?: No. You add things on top of the page, and the original text cannot be changed.
Is my PDF uploaded?: No. Everything happens on your device in your browser.

Sign PDF

How can I create my signature?: Draw it with your mouse or finger, type your name in a handwriting style, or upload an image of your signature. Then click on the page to place it.
Is this a legally binding digital signature?: It places an image of your signature on the page. It is not a certificate-based digital signature. Whether that is enough depends on the document and where you are, so check with the person asking for it.
Can I change the existing text in the PDF?: No. You add things on top of the page, and the original text stays as it is. Content hidden with "Cover" is only hidden and remains in the file, so use "Delete PDF Pages" to remove content completely.

Fill PDF Form

Which PDF forms are supported?: Standard PDF forms (AcroForm). XFA forms, JavaScript calculations and digital signature fields are not supported.
What if my PDF has no fields?: Use the "Write on PDF" tool to type anywhere on the page.
Is my personal information uploaded?: No. The form is filled on your device in your browser, so what you type never leaves it.

Create PDF Form

Which field types can I add?: Text fields, checkboxes, radio buttons and dropdown lists. Click or drag on the page to add a field and give each one a name.
Will the form work in other PDF viewers?: It creates a standard AcroForm, which opens and can be filled in most PDF viewers.
Are signature fields or calculations supported?: No. There are no digital signature fields or automatic calculations.

Image Tools

Image Converter

Which formats can I convert from and to?: You can open JPG, PNG, WebP, GIF, BMP, SVG and AVIF files, and convert them to JPG, PNG, WebP, BMP or ICO.
What happens to animated GIFs?: Only the first frame is kept, so the result is a still image.
Is metadata kept in the converted image?: No. Hidden metadata such as EXIF and GPS is removed from the result.

Image to Text (OCR)

Which languages and image types are supported?: English, Vietnamese, Spanish, Portuguese, Indonesian, French, German, Japanese and Korean. You can use JPG, PNG, WebP or BMP images.
How can I get the best result?: Use a sharp, well-lit image with horizontal text. Handwriting and very small text are not reliable, so always check the result.
Why is the first run slow?: The language data is loaded the first time you use a language, so the first run takes longer.

Image Compressor

What quality setting should I use?: About 70% is a good balance between size and quality for most photos. Lower it for smaller files, and raise it if you see blurring.
Does it remove hidden data such as GPS location?: Yes. Hidden metadata such as EXIF and GPS is removed from the result, which is useful before you share a photo online.
Are there limits on image size?: Images are decoded in your browser's memory, so very large images (over 100 megapixels) are refused.

Resize Image

Can I resize several images at once?: Yes. Every image in the batch uses the same settings.
Can I resize by percentage instead of pixels?: Yes. Enter a width and/or height in pixels, or a percentage.
Is hidden data such as GPS location removed?: Yes. Hidden metadata such as EXIF and GPS is removed from the result. Very large images (over 100 megapixels) are refused.

Enlarge Image

Does it use AI to add detail?: No. This tool does not use AI, so it cannot invent new detail. It enlarges smoothly and can sharpen the result.
How much bigger can I make an image?: 2, 3 or 4 times. A zoomed preview of the middle of the image shows the result before you enlarge.
Are there size limits?: Images are decoded in your browser's memory, so very large images (over 100 megapixels) are refused. Hidden metadata such as EXIF and GPS is removed from the result.

Crop Image

Can I crop to a fixed ratio?: Yes. Choose a ratio such as 1:1 or 16:9, or leave the shape free.
Can I set the crop box precisely?: Yes. Type exact values, or focus the box and nudge it with the arrow keys.
Is hidden data such as GPS location removed?: Yes. Hidden metadata such as EXIF and GPS is removed from the result. Very large images (over 100 megapixels) are refused.

Rotate Image

Can I rotate by an angle other than 90°?: Yes. Press a rotate button or type any angle, and the live preview shows the result.
Can I rotate several images at once?: Yes. The setting applies to every selected image.
Is hidden data such as GPS location removed?: Yes. Hidden metadata such as EXIF and GPS is removed from the result. Very large images (over 100 megapixels) are refused.

Flip Image

What is the difference between horizontal and vertical flip?: A horizontal flip mirrors the image left to right, like a mirror. A vertical flip turns it upside down. You can choose both.
Can I flip several images at once?: Yes. Select several images and they all get the same flip.
Is hidden data such as GPS location removed?: Yes. Hidden metadata such as EXIF and GPS is removed from the result. Very large images (over 100 megapixels) are refused.

QR Codes

QR Code Generator

Do the QR codes expire or track scans?: No. These are static QR codes: the code contains your content itself, not a link to our site. They never expire, and ToolyDay cannot see or count scans.
Can I add my logo and change the colors?: Yes. Choose any PNG, JPG or WebP logo, pick your colors and dot style, and the tool sets the error correction to High so the code still scans. A built-in scan check tells you if the result can be read.
Are my links and Wi-Fi password uploaded?: No. The code is made on your device in your browser. What you type never leaves it.

QR Code Reader

Does it open the link automatically?: No. The content is shown as text first. You choose whether to open a link, and it opens in a new tab only when you click.
Can it use my camera to scan live?: Yes. Press "Scan with camera" and allow the camera in your browser. The video is processed on your device only: nothing is recorded or sent. You can also take a photo or use a screenshot.
Is it safe to open a link from an unknown QR code?: The tool lists warning signs, such as link shorteners or look-alike characters, but it cannot tell you a link is safe. Only open links from sources you trust.

Security Tools

Password Generator

Is a password made here really random and private?: Yes. It is generated on your device with the browser’s secure random number generator. Nothing is sent to a server, saved or logged.
How long should my password be?: At least 16 characters for important accounts. Longer is stronger, and a password manager remembers it for you.
What does "avoid look-alike characters" do?: It leaves out characters that are easy to confuse when you read or type them, such as O and 0, or l, 1 and I. This helps if you must type the password by hand.

Password Strength Checker

Is my password sent anywhere when I test it?: No. The test runs on your device in your browser, and nothing is uploaded or saved. As a general habit, still avoid typing your real passwords into sites you do not trust.
How is the strength estimated?: From the length, the variety of characters and common weaknesses such as well-known passwords, keyboard patterns, repeated characters and years. It is an estimate, not a guarantee.
Does a strong result mean my password is safe?: Not always. The checker cannot know if your password appeared in a data breach or is reused on other sites. Use a different password for every account.

Hash Generator

Are my files uploaded to create the hash?: No. The hash is calculated on your device in your browser, so the file never leaves it.
How do I check that a download is genuine?: Choose the file, then paste the hash published by the download’s author into the compare box. If the hashes match, you will see a confirmation. Prefer SHA-256 or stronger.
Which algorithm should I use?: SHA-256 or SHA-512 for anything that matters. MD5 and SHA-1 are older and can be forged, so use them only for simple checksums when a site asks for them.

Text Encrypt & Decrypt

What encryption does it use?: AES-256-GCM, with a key made from your password using PBKDF2 and a random salt. Each time you encrypt, the result is different, even for the same text.
What if I forget the password?: The text cannot be recovered. The password never leaves your browser, so nobody, including us, can restore it.
How should I share the encrypted text?: Send the encrypted text and the password through different channels, for example the text by email and the password by phone. Use a long password, because a short one is easier to guess.

Base64 Encode & Decode

Is Base64 a form of encryption?: No. Base64 only changes how data is written so it can travel as plain text. Anyone can decode it, so never use it to hide passwords or secrets.
What is the URL-safe format?: It uses "-" and "_" instead of "+" and "/", and leaves out the "=" padding, so the result can be placed in a web address or a file name without extra encoding.
Why does decoding sometimes fail?: The text may contain characters that are not part of Base64, or it may be cut off. If the decoded data is not text (for example an image), the tool tells you.

URL Encode & Decode

What is the difference between "value" and "address" mode?: Value mode encodes every special character, which is right for a query parameter. Address mode keeps the characters that give a link its structure, such as : / ? # & and =, and is right for a whole link.
Why is a space shown as %20 or as +?: %20 is the standard way to write a space in a web address. Some forms use + instead. When decoding, you can choose to treat + as a space.
Does URL encoding make a link safe or secret?: No. It only makes the text valid inside a web address. Anyone can decode it.

File Checksum Checker

What does a match mean?: It means your file is identical to the one the checksum was made from. It does not prove that the checksum itself came from a trusted source, so get it from the official site.
Which checksum should I use?: SHA-256 or SHA-512 when the page offers them. MD5 and SHA-1 are older and can be forged, so treat a match as weaker proof.
Is my file uploaded?: No. The checksum is calculated on your device in your browser, and the file never leaves it.

Link Checker

Does the tool open or visit the link?: No. It only reads the text you paste, on your device. Nothing is sent anywhere and the site is never contacted.
If no warning signs are found, is the link safe?: Not necessarily. The tool cannot know a site’s reputation or what is on the page. Treat it as a quick check, and be careful with links from unknown senders.
How can I tell where a link really goes?: Look at the "Site" line: the real destination is the part just before the first single "/" after "https://". Everything to the left of it, including words that look like a bank name, can be a trick.