Online fundraising garners millions in charitable giving for the nonprofit industry every year, but there are so many options it can be difficult to find the right online donation tools for your organization.

Here are some of our favorite online donation tools, with an emphasis on widgets and donate buttons. They are all both easy for donors to use and affordable for nonprofit fundraising at all levels.

1. Google Checkout & Google Grants

Sign up for Google Checkout service and you’ll be provided with a donate button to use on your website. Furthermore, the Google Checkout process integrates with Google Wallet, which after the initial setup will allow donors to easily repeat donations in a few clicks. Not many options for personalization exist, but being associated with Google’s trusted brand will help assuage any fears about the online donation process.

While the standard service costs 2.9% + $0.30 per transaction, if you fit the application requirements, we strongly recommend applying for a Google Grant, which not only waives processing fees but also sets you up with AdWords, also completely free. It’ll take a few months to process your grant, but it’s worth it.

2. Razoo & Razoo Donation Widget

Razoo is a great website for indexing your nonprofit organization to get exposure for your cause. Use Razoo to set up fundraising pages, or make use of Razoo’s donation widget to easily process donations on your own website.

Razoo has a competitive 2.9% processing free per donation. Plus, the widget accepts recurring or one-time payments and is super easy to set up.

3. Network for Good DonateNow Lite

Network for Good’s DonateNow offers a variety of fundraising services and software to help get your online donations flowing, including branded donation pages, email services, and hands-on customer service.

While the DonateNow services range in expensive and can be prohibitive for smaller organizations, Network for Good offers a DonateNow Lite service which can be implemented with 5% transaction fees, recurring donation functionality, and a fundraising page.

4. PayPal Donations

PayPal offers services to help nonprofits with online donations, especially in the form of their handy donation buttons for qualified nonprofit organizations. As a plus, if you know some HTML, PayPal’s donation buttons allow you to easily gather donor information in a way many comparable buttons don’t.

PayPal’s a valuable, trusted brand for processing money online. It’s ideal for donors who are existing users, but those without accounts are free to make one-time payments with a credit card. The standard processing fee per donation is 2.2% of the donation, plus $0.30.

5. ChipIn

ChipIn is another very popular widget in the online fundraising world. Their widget interface shows a thermometer that fills as donations bring you closer to your fundraising goal. ChipIn integrates easily with Facebook and other social media outlets.

ChipIn’s widget is free, but runs through PayPal, so the same processing fees will apply.

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These are just a few low-expense, easy-to-integrate options for online fundraising, but there are many other venues to look into, especially if you’re looking beyond widget-based online tools.

Some additional recommendations:  Causes is great for social media fundraising, and sites like EventBrite and CrowdRise are excellent for promoting events and fundraising pages. If you still haven’t found what you’re looking for, check out GiveZooks, FirstGiving, Fundly, JustGive.org and Amazon SimplePay Donations for some more options.

What online donation tools have worked the best for your nonprofit?